From 9e1082d47bff4b6ff97677eede90976fedce367e Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Deyson=20Thom=C3=A9?= <seu-email-do-github@gmail.com>
Date: Wed, 2 Sep 2026 14:19:05 -0300
Subject: [PATCH] Initial reliable release of consent engine

---
 README.md                               |  57 +++
 core/categories.js                      | 197 +++++++++
 core/consent.js                         | 551 ++++++++++++++++++++++++
 core/events.js                          | 104 +++++
 core/storage.js                         | 216 ++++++++++
 integration/context.js                  |  45 ++
 integration/index.js                    |  34 ++
 jurisdiction/constants.js               |  38 ++
 jurisdiction/index.js                   |  35 ++
 jurisdiction/jurisdiction.js            |  73 ++++
 jurisdiction/policies.js                |  55 +++
 jurisdiction/resolver.js                | 215 +++++++++
 package.json                            |   1 +
 test-core.mjs                           | 180 ++++++++
 tests/audit/audit-test.html             | 136 ++++++
 tests/audit/audit-test.mjs              | 256 +++++++++++
 tests/integration/integration-test.html | 173 ++++++++
 tests/integration/integration-test.mjs  | 136 ++++++
 tests/jurisdiction-test.html            |  84 ++++
 tests/jurisdiction-test.mjs             | 196 +++++++++
 tests/reliability/reliability-test.mjs  | 525 ++++++++++++++++++++++
 tests/test.html                         |  70 +++
 22 files changed, 3377 insertions(+)
 create mode 100644 README.md
 create mode 100644 core/categories.js
 create mode 100644 core/consent.js
 create mode 100644 core/events.js
 create mode 100644 core/storage.js
 create mode 100644 integration/context.js
 create mode 100644 integration/index.js
 create mode 100644 jurisdiction/constants.js
 create mode 100644 jurisdiction/index.js
 create mode 100644 jurisdiction/jurisdiction.js
 create mode 100644 jurisdiction/policies.js
 create mode 100644 jurisdiction/resolver.js
 create mode 100644 package.json
 create mode 100644 test-core.mjs
 create mode 100644 tests/audit/audit-test.html
 create mode 100644 tests/audit/audit-test.mjs
 create mode 100644 tests/integration/integration-test.html
 create mode 100644 tests/integration/integration-test.mjs
 create mode 100644 tests/jurisdiction-test.html
 create mode 100644 tests/jurisdiction-test.mjs
 create mode 100644 tests/reliability/reliability-test.mjs
 create mode 100644 tests/test.html

diff --git a/README.md b/README.md
new file mode 100644
index 0000000..d661c7b
--- /dev/null
+++ b/README.md
@@ -0,0 +1,57 @@
+# Universal Cookie Consent — Jurisdiction Engine v1
+
+Stage 3.2 introduces a pure, deterministic Jurisdiction Engine.
+
+## Responsibilities
+
+The engine resolves a jurisdiction context and maps it to a policy family.
+It deliberately does **not**:
+
+- read IP addresses;
+- call geolocation APIs;
+- access browser location;
+- inspect GPC;
+- enforce consent;
+- modify the Core;
+- integrate GTM;
+- provide legal advice.
+
+## Modes
+
+- `fixed`: the site explicitly selects a jurisdiction.
+- `auto`: the site supports multiple jurisdictions and supplies available signals.
+- `global`: the site deliberately selects the global baseline for everyone.
+
+## Resolution priority
+
+`site-config` > `server` > `application` > `browser` > `fallback`
+
+The resolver is deterministic and uses only supplied signals.
+
+## Initial catalog
+
+- `global`
+- `us`
+- `us-ma`
+- `us-ca`
+- `eu`
+
+The policy catalog is intentionally a structural placeholder. Detailed legal requirements will be researched and added in a later policy stage rather than being guessed or embedded in the resolver.
+
+## Tests
+
+Node regression:
+
+```bash
+node tests/jurisdiction-test.mjs
+```
+
+Browser Test Lab:
+
+```bash
+python -m http.server 8000
+```
+
+Then open:
+
+`http://localhost:8000/tests/jurisdiction-test.html`
diff --git a/core/categories.js b/core/categories.js
new file mode 100644
index 0000000..732fbeb
--- /dev/null
+++ b/core/categories.js
@@ -0,0 +1,197 @@
+/**
+ * Cookie Consent Core
+ * categories.js
+ *
+ * Defines the consent categories and normalizes category state.
+ * This module has no DOM, storage, network, or GTM dependencies.
+ */
+
+export const CATEGORY_NAMES = Object.freeze([
+    "necessary",
+    "preferences",
+    "analytics",
+    "marketing"
+]);
+
+/**
+ * Legacy/default denied state kept as a public export for compatibility.
+ * New/undecided visitors should use createUnknownCategories().
+ */
+export const DEFAULT_CATEGORIES = Object.freeze({
+    necessary: "granted",
+    preferences: "denied",
+    analytics: "denied",
+    marketing: "denied"
+});
+
+const VALID_STATES = new Set(["unknown", "granted", "denied"]);
+
+export function createDefaultCategories() {
+    return { ...DEFAULT_CATEGORIES };
+}
+
+export function createUnknownCategories() {
+    return {
+        necessary: "granted",
+        preferences: "unknown",
+        analytics: "unknown",
+        marketing: "unknown"
+    };
+}
+
+export function isValidCategory(category) {
+    return CATEGORY_NAMES.includes(category);
+}
+
+export function isValidState(state) {
+    return VALID_STATES.has(state);
+}
+
+export function normalizeCategories(input = {}, fallback = DEFAULT_CATEGORIES) {
+    const source = input && typeof input === "object" ? input : {};
+    const fallbackState =
+        fallback && typeof fallback === "object"
+            ? fallback
+            : DEFAULT_CATEGORIES;
+
+    const normalized = {
+        necessary: "granted",
+        preferences: "denied",
+        analytics: "denied",
+        marketing: "denied"
+    };
+
+    for (const category of CATEGORY_NAMES) {
+        if (category === "necessary") {
+            normalized.necessary = "granted";
+            continue;
+        }
+
+        const candidate = source[category];
+
+        if (isValidState(candidate)) {
+            normalized[category] = candidate;
+            continue;
+        }
+
+        const fallbackValue = fallbackState[category];
+        normalized[category] = isValidState(fallbackValue)
+            ? fallbackValue
+            : "denied";
+    }
+
+    return normalized;
+}
+
+/**
+ * Strict validation used for persisted or externally supplied category
+ * objects. Unlike normalizeCategories(), this function never repairs data.
+ */
+export function isValidCategoriesObject(value) {
+    if (!value || typeof value !== "object" || Array.isArray(value)) {
+        return false;
+    }
+
+    for (const category of CATEGORY_NAMES) {
+        if (!Object.prototype.hasOwnProperty.call(value, category)) {
+            return false;
+        }
+    }
+
+    if (value.necessary !== "granted") {
+        return false;
+    }
+
+    return CATEGORY_NAMES
+        .filter((category) => category !== "necessary")
+        .every((category) => isValidState(value[category]));
+}
+
+export function mergeCategories(current, changes) {
+    const base = normalizeCategories(current, DEFAULT_CATEGORIES);
+    const incoming = changes && typeof changes === "object" ? changes : {};
+    const merged = { ...base };
+
+    for (const category of CATEGORY_NAMES) {
+        if (category === "necessary") {
+            if (Object.prototype.hasOwnProperty.call(incoming, category) &&
+                incoming[category] !== "granted") {
+                throw new TypeError(
+                    `Invalid consent state for "necessary". ` +
+                    `The necessary category must always be "granted".`
+                );
+            }
+
+            merged.necessary = "granted";
+            continue;
+        }
+
+        if (Object.prototype.hasOwnProperty.call(incoming, category)) {
+            const value = incoming[category];
+
+            if (!isValidState(value)) {
+                throw new TypeError(
+                    `Invalid consent state for "${category}". ` +
+                    `Expected "unknown", "granted", or "denied".`
+                );
+            }
+
+            merged[category] = value;
+        }
+    }
+
+    return merged;
+}
+
+export function createAcceptedCategories() {
+    return {
+        necessary: "granted",
+        preferences: "granted",
+        analytics: "granted",
+        marketing: "granted"
+    };
+}
+
+export function createRejectedCategories() {
+    return {
+        necessary: "granted",
+        preferences: "denied",
+        analytics: "denied",
+        marketing: "denied"
+    };
+}
+
+export function hasAcceptedAll(categories) {
+    const state = normalizeCategories(categories, DEFAULT_CATEGORIES);
+
+    return CATEGORY_NAMES
+        .filter((category) => category !== "necessary")
+        .every((category) => state[category] === "granted");
+}
+
+export function hasRejectedAll(categories) {
+    const state = normalizeCategories(categories, DEFAULT_CATEGORIES);
+
+    return CATEGORY_NAMES
+        .filter((category) => category !== "necessary")
+        .every((category) => state[category] === "denied");
+}
+
+export function isDecisionComplete(categories) {
+    const state = normalizeCategories(categories, createUnknownCategories());
+
+    return CATEGORY_NAMES
+        .filter((category) => category !== "necessary")
+        .every((category) => state[category] !== "unknown");
+}
+
+export function toPermissionMap(categories) {
+    const state = normalizeCategories(categories, DEFAULT_CATEGORIES);
+
+    return Object.fromEntries(
+        CATEGORY_NAMES.map((category) => [
+            category,
+            state[category] === "granted"
+        ])
+    );
+}
diff --git a/core/consent.js b/core/consent.js
new file mode 100644
index 0000000..fe35c27
--- /dev/null
+++ b/core/consent.js
@@ -0,0 +1,551 @@
+/**
+ * Cookie Consent Core
+ * consent.js
+ *
+ * Main consent engine.
+ *
+ * Responsibilities:
+ * - initialize consent state
+ * - load/save persisted consent
+ * - manage categories
+ * - manage policy version
+ * - expose consent operations
+ * - emit lifecycle events
+ *
+ * Deliberately excluded:
+ * - DOM/UI
+ * - GTM
+ * - geolocation
+ * - network requests
+ * - legal/jurisdiction rules
+ */
+
+import {
+    createDefaultCategories,
+    createUnknownCategories,
+    createAcceptedCategories,
+    createRejectedCategories,
+    normalizeCategories,
+    mergeCategories,
+    hasAcceptedAll,
+    hasRejectedAll,
+    isDecisionComplete,
+    isValidCategoriesObject,
+    toPermissionMap
+} from "./categories.js";
+
+import {
+    createCookieStorage,
+    isStoragePayload,
+    STORAGE_DEFAULTS
+} from "./storage.js";
+
+import { createEventBus } from "./events.js";
+
+export const ENGINE_VERSION = "1.0.1";
+export const DEFAULT_POLICY_VERSION = "2026-01";
+export const DEFAULT_JURISDICTION = "global";
+
+const DEFAULT_CONFIG = Object.freeze({
+    policyVersion: DEFAULT_POLICY_VERSION,
+    jurisdiction: DEFAULT_JURISDICTION,
+    requireDecision: true,
+    storage: {
+        name: STORAGE_DEFAULTS.name,
+        duration: STORAGE_DEFAULTS.duration,
+        path: STORAGE_DEFAULTS.path,
+        sameSite: STORAGE_DEFAULTS.sameSite
+    }
+});
+
+function isPlainObject(value) {
+    return Boolean(
+        value &&
+        typeof value === "object" &&
+        !Array.isArray(value)
+    );
+}
+
+function clone(value) {
+    return JSON.parse(JSON.stringify(value));
+}
+
+function mergeConfig(base, overrides) {
+    const source = isPlainObject(overrides) ? overrides : {};
+
+    return {
+        ...base,
+        ...source,
+        storage: {
+            ...base.storage,
+            ...(isPlainObject(source.storage) ? source.storage : {})
+        }
+    };
+}
+
+function buildStoredPayload({
+    categories,
+    policyVersion,
+    jurisdiction,
+    gpc,
+    timestamp
+}) {
+    return {
+        engineVersion: ENGINE_VERSION,
+        policyVersion,
+        timestamp,
+        categories: clone(categories),
+        jurisdiction,
+        gpc: Boolean(gpc)
+    };
+}
+
+function isExpired(payload, durationDays, currentTime = Date.now()) {
+    if (!payload || !Number.isFinite(payload.timestamp)) {
+        return true;
+    }
+
+    if (!Number.isFinite(durationDays) || durationDays <= 0) {
+        return false;
+    }
+
+    const durationMs = durationDays * 24 * 60 * 60 * 1000;
+    const age = currentTime - payload.timestamp;
+
+    // A materially future timestamp is not accepted as valid persistence.
+    if (age < 0) {
+        return true;
+    }
+
+    return age >= durationMs;
+}
+
+function getInitialState(config) {
+    return {
+        initialized: false,
+        hasDecision: false,
+        categories: createUnknownCategories(),
+        policyVersion: config.policyVersion,
+        jurisdiction: config.jurisdiction,
+        gpc: false,
+        timestamp: null,
+        source: "default"
+    };
+}
+
+function categoriesEqual(a, b) {
+    return (
+        a.necessary === b.necessary &&
+        a.preferences === b.preferences &&
+        a.analytics === b.analytics &&
+        a.marketing === b.marketing
+    );
+}
+
+export function createConsentEngine(options = {}) {
+    const config = mergeConfig(DEFAULT_CONFIG, options);
+    const events = createEventBus();
+    const storage = createCookieStorage(config.storage);
+
+    let state = getInitialState(config);
+    let initialized = false;
+
+    function getState() {
+        return clone(state);
+    }
+
+    function emit(name, extra = {}) {
+        events.emit(name, {
+            ...getState(),
+            ...extra
+        });
+    }
+
+    function persist(categories, metadata = {}) {
+        const timestamp = Date.now();
+
+        const payload = buildStoredPayload({
+            categories,
+            policyVersion: config.policyVersion,
+            jurisdiction:
+                metadata.jurisdiction || config.jurisdiction,
+            gpc:
+                typeof metadata.gpc === "boolean"
+                    ? metadata.gpc
+                    : state.gpc,
+            timestamp
+        });
+
+        try {
+            const saved = storage.set(payload);
+
+            if (!saved) {
+                events.emit("storage:error", {
+                    operation: "set",
+                    payload: getState()
+                });
+
+                return false;
+            }
+
+            state = {
+                ...state,
+                categories: normalizeCategories(
+                    payload.categories,
+                    createDefaultCategories()
+                ),
+                hasDecision: isDecisionComplete(payload.categories),
+                policyVersion: payload.policyVersion,
+                jurisdiction: payload.jurisdiction,
+                gpc: Boolean(payload.gpc),
+                timestamp: payload.timestamp,
+                source: metadata.source || "user"
+            };
+
+            return true;
+        } catch (error) {
+            events.emit("storage:error", {
+                operation: "set",
+                error
+            });
+
+            return false;
+        }
+    }
+
+    function removePersistedCookie(operation) {
+        try {
+            const removed = storage.remove();
+
+            if (!removed) {
+                events.emit("storage:error", {
+                    operation
+                });
+                return false;
+            }
+
+            return true;
+        } catch (error) {
+            events.emit("storage:error", {
+                operation,
+                error
+            });
+            return false;
+        }
+    }
+
+    function loadPersistedState() {
+        let payload;
+
+        try {
+            payload = storage.get();
+        } catch (error) {
+            events.emit("storage:error", {
+                operation: "get",
+                error
+            });
+            return false;
+        }
+
+        if (!isStoragePayload(payload)) {
+            return false;
+        }
+
+        if (!isValidCategoriesObject(payload.categories)) {
+            // Invalid persistence is not allowed to influence the live state.
+            // Attempt to remove it so it cannot repeatedly poison initialization.
+            removePersistedCookie("remove-invalid");
+            return false;
+        }
+
+        if (payload.policyVersion !== config.policyVersion) {
+            removePersistedCookie("remove-policy-mismatch");
+            return false;
+        }
+
+        if (isExpired(payload, config.storage.duration)) {
+            const removed = removePersistedCookie("remove-expired");
+
+            if (!removed) {
+                // Do not pretend the stale cookie has been removed.
+                // The in-memory state remains undecided for this page load.
+                state = {
+                    ...state,
+                    categories: createUnknownCategories(),
+                    hasDecision: false,
+                    timestamp: null,
+                    source: "expired"
+                };
+
+                emit("consent:expired");
+                return false;
+            }
+
+            state = {
+                ...state,
+                categories: createUnknownCategories(),
+                hasDecision: false,
+                timestamp: null,
+                source: "expired"
+            };
+
+            emit("consent:expired");
+            return false;
+        }
+
+        state = {
+            ...state,
+            categories: normalizeCategories(
+                payload.categories,
+                createUnknownCategories()
+            ),
+            hasDecision: isDecisionComplete(payload.categories),
+            policyVersion: config.policyVersion,
+            jurisdiction: payload.jurisdiction,
+            gpc: payload.gpc,
+            timestamp: payload.timestamp,
+            source: "storage"
+        };
+
+        emit("consent:loaded");
+        return true;
+    }
+
+    function initialize() {
+        if (initialized) {
+            return getState();
+        }
+
+        initialized = true;
+        loadPersistedState();
+
+        state = {
+            ...state,
+            initialized: true
+        };
+
+        emit("initialized");
+        return getState();
+    }
+
+    function ensureInitialized() {
+        if (!initialized) {
+            initialize();
+        }
+    }
+
+    function setConsent(changes, metadata = {}) {
+        ensureInitialized();
+
+        if (!isPlainObject(changes)) {
+            throw new TypeError("Consent changes must be an object.");
+        }
+
+        const previous = state.categories;
+        const next = mergeCategories(previous, changes);
+        const changed = !categoriesEqual(previous, next);
+
+        if (!changed) {
+            return getState();
+        }
+
+        const saved = persist(next, metadata);
+
+        if (!saved) {
+            return getState();
+        }
+
+        emit("consent:changed", {
+            previousCategories: previous,
+            categories: next
+        });
+
+        if (hasAcceptedAll(next)) {
+            emit("consent:accepted");
+        } else if (hasRejectedAll(next)) {
+            emit("consent:rejected");
+        }
+
+        return getState();
+    }
+
+    function acceptAll() {
+        ensureInitialized();
+
+        const previous = state.categories;
+        const next = createAcceptedCategories();
+
+        if (categoriesEqual(previous, next)) {
+            return getState();
+        }
+
+        const saved = persist(next);
+
+        if (!saved) {
+            return getState();
+        }
+
+        emit("consent:changed", {
+            previousCategories: previous,
+            categories: next
+        });
+
+        emit("consent:accepted");
+        return getState();
+    }
+
+    function rejectAll() {
+        ensureInitialized();
+
+        const previous = state.categories;
+        const next = createRejectedCategories();
+
+        if (categoriesEqual(previous, next)) {
+            return getState();
+        }
+
+        const saved = persist(next);
+
+        if (!saved) {
+            return getState();
+        }
+
+        emit("consent:changed", {
+            previousCategories: previous,
+            categories: next
+        });
+
+        emit("consent:rejected");
+        return getState();
+    }
+
+    function revoke() {
+        ensureInitialized();
+
+        const previous = state.categories;
+        const next = createRejectedCategories();
+
+        if (categoriesEqual(previous, next)) {
+            return getState();
+        }
+
+        const saved = persist(next, {
+            jurisdiction: state.jurisdiction,
+            gpc: state.gpc,
+            source: "user"
+        });
+
+        if (!saved) {
+            return getState();
+        }
+
+        emit("consent:revoked", {
+            previousCategories: previous,
+            categories: next
+        });
+
+        emit("consent:changed", {
+            previousCategories: previous,
+            categories: next
+        });
+
+        return getState();
+    }
+
+    function reset() {
+        ensureInitialized();
+
+        const removed = removePersistedCookie("remove-reset");
+
+        if (!removed) {
+            // Do not create a false local reset when persisted consent may
+            // still exist. This guarantees reload consistency.
+            return getState();
+        }
+
+        state = getInitialState(config);
+        state.initialized = true;
+
+        emit("consent:reset");
+        return getState();
+    }
+
+    function setGpc(value) {
+        ensureInitialized();
+
+        state = {
+            ...state,
+            gpc: Boolean(value)
+        };
+
+        return getState();
+    }
+
+    function setJurisdiction(value) {
+        ensureInitialized();
+
+        if (typeof value !== "string" || !value.trim()) {
+            throw new TypeError(
+                "jurisdiction must be a non-empty string."
+            );
+        }
+
+        state = {
+            ...state,
+            jurisdiction: value.trim()
+        };
+
+        return getState();
+    }
+
+    function hasConsent(category) {
+        ensureInitialized();
+
+        if (
+            typeof category !== "string" ||
+            !Object.prototype.hasOwnProperty.call(
+                state.categories,
+                category
+            )
+        ) {
+            return false;
+        }
+
+        return state.categories[category] === "granted";
+    }
+
+    function isComplete() {
+        ensureInitialized();
+        return state.hasDecision;
+    }
+
+    function isInitialized() {
+        return initialized;
+    }
+
+    return Object.freeze({
+        initialize,
+        getState,
+        getConsent: getState,
+        setConsent,
+        acceptAll,
+        rejectAll,
+        revoke,
+        reset,
+        setGpc,
+        setJurisdiction,
+        hasConsent,
+        isComplete,
+        isInitialized,
+        toPermissionMap() {
+            ensureInitialized();
+            return toPermissionMap(state.categories);
+        },
+        getConfig() {
+            return clone(config);
+        },
+        on: events.on,
+        once: events.once,
+        off: events.off
+    });
+}
diff --git a/core/events.js b/core/events.js
new file mode 100644
index 0000000..b128dff
--- /dev/null
+++ b/core/events.js
@@ -0,0 +1,104 @@
+/**
+ * Cookie Consent Core
+ * events.js
+ *
+ * Tiny dependency-free event bus.
+ */
+
+export function createEventBus() {
+    const listeners = new Map();
+
+    function on(eventName, callback) {
+        if (typeof eventName !== "string" || !eventName.trim()) {
+            throw new TypeError("eventName must be a non-empty string.");
+        }
+
+        if (typeof callback !== "function") {
+            throw new TypeError("callback must be a function.");
+        }
+
+        if (!listeners.has(eventName)) {
+            listeners.set(eventName, new Set());
+        }
+
+        listeners.get(eventName).add(callback);
+        return () => off(eventName, callback);
+    }
+
+    function once(eventName, callback) {
+        const unsubscribe = on(eventName, (payload) => {
+            unsubscribe();
+            callback(payload);
+        });
+
+        return unsubscribe;
+    }
+
+    function off(eventName, callback) {
+        const callbacks = listeners.get(eventName);
+
+        if (!callbacks) {
+            return false;
+        }
+
+        const removed = callbacks.delete(callback);
+
+        if (callbacks.size === 0) {
+            listeners.delete(eventName);
+        }
+
+        return removed;
+    }
+
+    function emit(eventName, payload) {
+        const callbacks = listeners.get(eventName);
+
+        if (!callbacks) {
+            return;
+        }
+
+        [...callbacks].forEach((callback) => {
+            try {
+                callback(payload);
+            } catch (error) {
+                queueMicrotask(() => {
+                    throw error;
+                });
+            }
+        });
+    }
+
+    function clear(eventName) {
+        if (typeof eventName === "string") {
+            listeners.delete(eventName);
+            return;
+        }
+
+        listeners.clear();
+    }
+
+    function listenerCount(eventName) {
+        return listeners.get(eventName)?.size || 0;
+    }
+
+    return Object.freeze({
+        on,
+        once,
+        off,
+        emit,
+        clear,
+        listenerCount
+    });
+}
+
+export const EVENT_NAMES = Object.freeze([
+    "initialized",
+    "consent:loaded",
+    "consent:accepted",
+    "consent:rejected",
+    "consent:changed",
+    "consent:revoked",
+    "consent:expired",
+    "consent:reset",
+    "storage:error"
+]);
diff --git a/core/storage.js b/core/storage.js
new file mode 100644
index 0000000..d6fb936
--- /dev/null
+++ b/core/storage.js
@@ -0,0 +1,216 @@
+/**
+ * Cookie Consent Core
+ * storage.js
+ *
+ * Cookie-based persistence for consent state.
+ * This module deliberately contains no consent/business operations.
+ */
+
+const DEFAULT_COOKIE_NAME = "cc_consent";
+const DEFAULT_DURATION_DAYS = 180;
+const DEFAULT_PATH = "/";
+const DEFAULT_SAME_SITE = "Lax";
+
+function isBrowser() {
+    return typeof document !== "undefined";
+}
+
+function encode(value) {
+    return encodeURIComponent(value);
+}
+
+function decode(value) {
+    try {
+        return decodeURIComponent(value);
+    } catch {
+        return null;
+    }
+}
+
+function buildAttributes(options = {}) {
+    const {
+        duration,
+        path = DEFAULT_PATH,
+        domain,
+        sameSite = DEFAULT_SAME_SITE,
+        secure,
+        partitioned = false
+    } = options;
+
+    const attributes = [];
+
+    if (typeof duration === "number" && Number.isFinite(duration)) {
+        if (duration <= 0) {
+            attributes.push("Max-Age=0");
+        } else {
+            const maxAge = Math.floor(duration * 24 * 60 * 60);
+            attributes.push(`Max-Age=${maxAge}`);
+        }
+    }
+
+    if (path) {
+        attributes.push(`Path=${path}`);
+    }
+
+    if (domain) {
+        attributes.push(`Domain=${domain}`);
+    }
+
+    if (sameSite) {
+        attributes.push(`SameSite=${sameSite}`);
+    }
+
+    const shouldSecure =
+        secure === true ||
+        (secure === undefined &&
+            typeof location !== "undefined" &&
+            location.protocol === "https:");
+
+    if (shouldSecure) {
+        attributes.push("Secure");
+    }
+
+    if (partitioned) {
+        attributes.push("Partitioned");
+    }
+
+    return attributes.join("; ");
+}
+
+export function createCookieStorage(options = {}) {
+    const config = {
+        name: options.name || DEFAULT_COOKIE_NAME,
+        duration:
+            typeof options.duration === "number"
+                ? options.duration
+                : DEFAULT_DURATION_DAYS,
+        path: options.path || DEFAULT_PATH,
+        domain: options.domain,
+        sameSite: options.sameSite || DEFAULT_SAME_SITE,
+        secure: options.secure,
+        partitioned: options.partitioned === true
+    };
+
+    return Object.freeze({
+        name: config.name,
+
+        getRaw() {
+            if (!isBrowser()) {
+                return null;
+            }
+
+            const prefix = `${encode(config.name)}=`;
+            const cookies = document.cookie ? document.cookie.split("; ") : [];
+
+            for (const item of cookies) {
+                if (item.startsWith(prefix)) {
+                    return decode(item.slice(prefix.length));
+                }
+            }
+
+            return null;
+        },
+
+        get() {
+            const raw = this.getRaw();
+
+            if (!raw) {
+                return null;
+            }
+
+            try {
+                return JSON.parse(raw);
+            } catch {
+                return null;
+            }
+        },
+
+        set(payload) {
+            if (!isBrowser()) {
+                return false;
+            }
+
+            let serialized;
+
+            try {
+                serialized = JSON.stringify(payload);
+            } catch {
+                return false;
+            }
+
+            const attributes = buildAttributes(config);
+
+            document.cookie =
+                `${encode(config.name)}=${encode(serialized)}` +
+                (attributes ? `; ${attributes}` : "");
+
+            return this.getRaw() !== null;
+        },
+
+        remove() {
+            if (!isBrowser()) {
+                return false;
+            }
+
+            const attributes = buildAttributes({
+                ...config,
+                duration: 0
+            });
+
+            document.cookie =
+                `${encode(config.name)}=` +
+                (attributes ? `; ${attributes}` : "");
+
+            return this.getRaw() === null;
+        },
+
+        getConfig() {
+            return { ...config };
+        }
+    });
+}
+
+/**
+ * Validates the persisted envelope before the consent engine attempts to
+ * interpret its contents. Category semantics are validated separately.
+ */
+export function isStoragePayload(value) {
+    if (!value || typeof value !== "object" || Array.isArray(value)) {
+        return false;
+    }
+
+    if (typeof value.engineVersion !== "string" || !value.engineVersion) {
+        return false;
+    }
+
+    if (typeof value.policyVersion !== "string" || !value.policyVersion) {
+        return false;
+    }
+
+    if (!Number.isFinite(value.timestamp)) {
+        return false;
+    }
+
+    if (!value.categories ||
+        typeof value.categories !== "object" ||
+        Array.isArray(value.categories)) {
+        return false;
+    }
+
+    if (typeof value.jurisdiction !== "string" || !value.jurisdiction) {
+        return false;
+    }
+
+    if (typeof value.gpc !== "boolean") {
+        return false;
+    }
+
+    return true;
+}
+
+export const STORAGE_DEFAULTS = Object.freeze({
+    name: DEFAULT_COOKIE_NAME,
+    duration: DEFAULT_DURATION_DAYS,
+    path: DEFAULT_PATH,
+    sameSite: DEFAULT_SAME_SITE
+});
diff --git a/integration/context.js b/integration/context.js
new file mode 100644
index 0000000..1a48c45
--- /dev/null
+++ b/integration/context.js
@@ -0,0 +1,45 @@
+/**
+ * Universal Cookie Consent
+ * integration/context.js
+ *
+ * Thin integration boundary between the pure Jurisdiction Engine and
+ * the independent Consent Core.
+ *
+ * The jurisdiction result is context only. It never grants or denies
+ * consent categories.
+ */
+
+import {
+    resolveJurisdiction,
+    isValidResolution
+} from "../jurisdiction/index.js";
+
+function freezeResolution(resolution) {
+    return Object.freeze({
+        status: resolution.status,
+        jurisdiction: Object.freeze({ ...resolution.jurisdiction }),
+        policy: Object.freeze({ ...resolution.policy }),
+        source: resolution.source,
+        confidence: resolution.confidence
+    });
+}
+
+export function resolveConsentContext(input = {}) {
+    const resolution = resolveJurisdiction(input);
+
+    if (!isValidResolution(resolution)) {
+        throw new Error("Jurisdiction Engine returned an invalid resolution.");
+    }
+
+    return Object.freeze({
+        resolution: freezeResolution(resolution)
+    });
+}
+
+export function getConsentJurisdiction(input = {}) {
+    return resolveConsentContext(input).resolution.jurisdiction.id;
+}
+
+export function getConsentPolicy(input = {}) {
+    return resolveConsentContext(input).resolution.policy.id;
+}
diff --git a/integration/index.js b/integration/index.js
new file mode 100644
index 0000000..a7b2ced
--- /dev/null
+++ b/integration/index.js
@@ -0,0 +1,34 @@
+/**
+ * Universal Cookie Consent
+ * integration/index.js
+ *
+ * Public integration API.
+ *
+ * Jurisdiction resolution is performed before the Consent Core is created.
+ * The resolved jurisdiction becomes Core configuration; it does not become
+ * a consent decision.
+ */
+
+import { createConsentEngine } from "../core/consent.js";
+import { resolveConsentContext } from "./context.js";
+
+export { resolveConsentContext } from "./context.js";
+
+export function createIntegratedConsentEngine({
+    jurisdiction = {},
+    core = {}
+} = {}) {
+    const context = resolveConsentContext(jurisdiction);
+
+    const engine = createConsentEngine({
+        ...core,
+        jurisdiction: context.resolution.jurisdiction.id
+    });
+
+    return Object.freeze({
+        ...engine,
+        getJurisdictionContext() {
+            return context;
+        }
+    });
+}
diff --git a/jurisdiction/constants.js b/jurisdiction/constants.js
new file mode 100644
index 0000000..5c7e4ed
--- /dev/null
+++ b/jurisdiction/constants.js
@@ -0,0 +1,38 @@
+/**
+ * Universal Cookie Consent
+ * jurisdiction/constants.js
+ *
+ * Pure constants for jurisdiction resolution. No DOM, network, storage,
+ * geolocation, GTM, or legal enforcement logic belongs here.
+ */
+
+export const JURISDICTION_MODES = Object.freeze([
+    "fixed",
+    "auto",
+    "global"
+]);
+
+export const RESOLUTION_SOURCES = Object.freeze([
+    "site-config",
+    "server",
+    "application",
+    "browser",
+    "fallback"
+]);
+
+export const CONFIDENCE_LEVELS = Object.freeze([
+    "explicit",
+    "high",
+    "medium",
+    "low",
+    "default"
+]);
+
+export const RESOLUTION_STATUSES = Object.freeze([
+    "resolved",
+    "fallback"
+]);
+
+export const DEFAULT_JURISDICTION_ID = "global";
+export const DEFAULT_POLICY_ID = "global-baseline";
+export const DEFAULT_MODE = "auto";
diff --git a/jurisdiction/index.js b/jurisdiction/index.js
new file mode 100644
index 0000000..91ce070
--- /dev/null
+++ b/jurisdiction/index.js
@@ -0,0 +1,35 @@
+/**
+ * Universal Cookie Consent
+ * jurisdiction/index.js
+ *
+ * Public API for the Jurisdiction Engine.
+ */
+
+export {
+    JURISDICTION_MODES,
+    RESOLUTION_SOURCES,
+    CONFIDENCE_LEVELS,
+    RESOLUTION_STATUSES,
+    DEFAULT_JURISDICTION_ID,
+    DEFAULT_POLICY_ID,
+    DEFAULT_MODE
+} from "./constants.js";
+
+export {
+    JURISDICTION_CATALOG,
+    getJurisdiction,
+    hasJurisdiction
+} from "./jurisdiction.js";
+
+export {
+    POLICIES,
+    getPolicy,
+    hasPolicy
+} from "./policies.js";
+
+export {
+    resolveJurisdiction,
+    getResolutionPriority,
+    getSourceConfidence,
+    isValidResolution
+} from "./resolver.js";
diff --git a/jurisdiction/jurisdiction.js b/jurisdiction/jurisdiction.js
new file mode 100644
index 0000000..b346e39
--- /dev/null
+++ b/jurisdiction/jurisdiction.js
@@ -0,0 +1,73 @@
+/**
+ * Universal Cookie Consent
+ * jurisdiction/jurisdiction.js
+ *
+ * Declarative jurisdiction catalog. This file maps jurisdiction identifiers
+ * to policy identifiers. It does not detect visitors or enforce consent.
+ */
+
+import { hasPolicy } from "./policies.js";
+
+const JURISDICTIONS = {
+    global: {
+        id: "global",
+        country: null,
+        region: null,
+        policy: "global-baseline"
+    },
+
+    us: {
+        id: "us",
+        country: "US",
+        region: null,
+        policy: "us-state-privacy"
+    },
+
+    "us-ma": {
+        id: "us-ma",
+        country: "US",
+        region: "MA",
+        policy: "us-state-privacy"
+    },
+
+    "us-ca": {
+        id: "us-ca",
+        country: "US",
+        region: "CA",
+        policy: "us-california-privacy"
+    },
+
+    eu: {
+        id: "eu",
+        country: "EU",
+        region: null,
+        policy: "eu-privacy"
+    }
+};
+
+for (const entry of Object.values(JURISDICTIONS)) {
+    if (!hasPolicy(entry.policy)) {
+        throw new Error(`Jurisdiction references unknown policy: ${entry.policy}`);
+    }
+}
+
+export const JURISDICTION_CATALOG = Object.freeze(
+    Object.fromEntries(
+        Object.entries(JURISDICTIONS).map(([id, value]) => [
+            id,
+            Object.freeze({ ...value })
+        ])
+    )
+);
+
+export function getJurisdiction(id) {
+    if (typeof id !== "string") {
+        return null;
+    }
+
+    return JURISDICTION_CATALOG[id] || null;
+}
+
+export function hasJurisdiction(id) {
+    return Boolean(getJurisdiction(id));
+}
diff --git a/jurisdiction/policies.js b/jurisdiction/policies.js
new file mode 100644
index 0000000..62b2817
--- /dev/null
+++ b/jurisdiction/policies.js
@@ -0,0 +1,55 @@
+/**
+ * Universal Cookie Consent
+ * jurisdiction/policies.js
+ *
+ * Declarative policy catalog.
+ *
+ * IMPORTANT:
+ * These entries identify policy families only. They are NOT legal advice and
+ * deliberately do not encode detailed legal requirements yet. Those rules
+ * will be added after current-source legal research and policy review.
+ */
+
+const freeze = (value) => Object.freeze(value);
+
+export const POLICIES = Object.freeze({
+    "global-baseline": freeze({
+        id: "global-baseline",
+        family: "global",
+        version: "1.0",
+        description: "Conservative global baseline pending jurisdiction-specific policy."
+    }),
+
+    "us-state-privacy": freeze({
+        id: "us-state-privacy",
+        family: "us-state",
+        version: "1.0",
+        description: "Policy family for U.S. state privacy regimes."
+    }),
+
+    "us-california-privacy": freeze({
+        id: "us-california-privacy",
+        family: "us-state",
+        version: "1.0",
+        description: "Policy family reserved for California-specific requirements."
+    }),
+
+    "eu-privacy": freeze({
+        id: "eu-privacy",
+        family: "eu",
+        version: "1.0",
+        description: "Policy family reserved for applicable European privacy requirements."
+    })
+});
+
+export function getPolicy(policyId) {
+    if (typeof policyId !== "string") {
+        return null;
+    }
+
+    return POLICIES[policyId] || null;
+}
+
+export function hasPolicy(policyId) {
+    return Boolean(getPolicy(policyId));
+}
diff --git a/jurisdiction/resolver.js b/jurisdiction/resolver.js
new file mode 100644
index 0000000..70c027b
--- /dev/null
+++ b/jurisdiction/resolver.js
@@ -0,0 +1,215 @@
+/**
+ * Universal Cookie Consent
+ * jurisdiction/resolver.js
+ *
+ * Pure deterministic jurisdiction resolver.
+ *
+ * It consumes explicitly supplied signals. It never performs network calls,
+ * reads IP addresses, accesses browser location, or guesses silently.
+ */
+
+import {
+    JURISDICTION_MODES,
+    RESOLUTION_SOURCES,
+    CONFIDENCE_LEVELS,
+    DEFAULT_JURISDICTION_ID,
+    DEFAULT_POLICY_ID,
+    DEFAULT_MODE
+} from "./constants.js";
+import { getJurisdiction, hasJurisdiction } from "./jurisdiction.js";
+import { getPolicy, hasPolicy } from "./policies.js";
+
+const SOURCE_CONFIDENCE = Object.freeze({
+    "site-config": "explicit",
+    server: "high",
+    application: "medium",
+    browser: "low",
+    fallback: "default"
+});
+
+const SOURCE_PRIORITY = Object.freeze({
+    "site-config": 500,
+    server: 400,
+    application: 300,
+    browser: 200,
+    fallback: 100
+});
+
+function isPlainObject(value) {
+    return Boolean(
+        value &&
+        typeof value === "object" &&
+        !Array.isArray(value)
+    );
+}
+
+function normalizeString(value) {
+    return typeof value === "string" ? value.trim() : "";
+}
+
+function assertMode(mode) {
+    if (!JURISDICTION_MODES.includes(mode)) {
+        throw new TypeError(
+            `Invalid jurisdiction mode. Expected: ${JURISDICTION_MODES.join(", ")}.`
+        );
+    }
+}
+
+function resolveEntry(id, source, status = "resolved") {
+    const entry = getJurisdiction(id);
+
+    if (!entry) {
+        throw new Error(`Unknown jurisdiction: ${id}`);
+    }
+
+    const policy = getPolicy(entry.policy);
+
+    if (!policy) {
+        throw new Error(`Unknown policy: ${entry.policy}`);
+    }
+
+    return Object.freeze({
+        status,
+        jurisdiction: Object.freeze({
+            id: entry.id,
+            country: entry.country,
+            region: entry.region
+        }),
+        policy: Object.freeze({
+            id: policy.id,
+            family: policy.family,
+            version: policy.version
+        }),
+        source,
+        confidence: SOURCE_CONFIDENCE[source]
+    });
+}
+
+function normalizeSignal(signal, fallbackSource) {
+    if (!isPlainObject(signal)) {
+        return null;
+    }
+
+    const id = normalizeString(signal.jurisdiction || signal.id);
+    if (!id || !hasJurisdiction(id)) {
+        return null;
+    }
+
+    const source = normalizeString(signal.source) || fallbackSource;
+    if (!RESOLUTION_SOURCES.includes(source)) {
+        return null;
+    }
+
+    return {
+        id,
+        source,
+        priority: SOURCE_PRIORITY[source]
+    };
+}
+
+function chooseBestSignal(signals) {
+    const candidates = [];
+
+    for (const signal of signals) {
+        const normalized = normalizeSignal(signal, "browser");
+        if (normalized) {
+            candidates.push(normalized);
+        }
+    }
+
+    if (!candidates.length) {
+        return null;
+    }
+
+    candidates.sort((a, b) => b.priority - a.priority);
+    return candidates[0];
+}
+
+function resolveAuto(input) {
+    const site = isPlainObject(input.site) ? input.site : {};
+    const request = isPlainObject(input.request) ? input.request : {};
+    const visitor = isPlainObject(input.visitor) ? input.visitor : {};
+
+    const signal = chooseBestSignal([
+        { jurisdiction: request.jurisdiction, source: request.source || "server" },
+        { jurisdiction: request.regionJurisdiction, source: request.regionSource || "server" },
+        { jurisdiction: visitor.jurisdiction, source: visitor.source || "browser" },
+        { jurisdiction: visitor.regionJurisdiction, source: visitor.regionSource || "browser" },
+        { jurisdiction: site.jurisdiction, source: site.source || "application" }
+    ]);
+
+    if (signal) {
+        return resolveEntry(signal.id, signal.source);
+    }
+
+    return resolveEntry(DEFAULT_JURISDICTION_ID, "fallback", "fallback");
+}
+
+export function resolveJurisdiction(input = {}) {
+    if (!isPlainObject(input)) {
+        throw new TypeError("Jurisdiction input must be an object.");
+    }
+
+    const site = isPlainObject(input.site) ? input.site : {};
+    const mode = normalizeString(input.mode || site.mode || DEFAULT_MODE) || DEFAULT_MODE;
+
+    assertMode(mode);
+
+    if (mode === "global") {
+        return resolveEntry(DEFAULT_JURISDICTION_ID, "site-config");
+    }
+
+    if (mode === "fixed") {
+        const id = normalizeString(input.jurisdiction || site.jurisdiction);
+
+        if (!id) {
+            throw new TypeError(
+                "A jurisdiction is required when mode is \"fixed\"."
+            );
+        }
+
+        if (!hasJurisdiction(id)) {
+            throw new RangeError(`Unknown jurisdiction: ${id}`);
+        }
+
+        return resolveEntry(id, "site-config");
+    }
+
+    return resolveAuto(input);
+}
+
+export function getResolutionPriority(source) {
+    return SOURCE_PRIORITY[source] || 0;
+}
+
+export function getSourceConfidence(source) {
+    return SOURCE_CONFIDENCE[source] || null;
+}
+
+export function isValidResolution(result) {
+    if (!isPlainObject(result)) {
+        return false;
+    }
+
+    if (!Object.prototype.hasOwnProperty.call(result, "status")) {
+        return false;
+    }
+
+    if (!Object.prototype.hasOwnProperty.call(result, "jurisdiction")) {
+        return false;
+    }
+
+    if (!Object.prototype.hasOwnProperty.call(result, "policy")) {
+        return false;
+    }
+
+    return (
+        (result.status === "resolved" || result.status === "fallback") &&
+        typeof result.jurisdiction.id === "string" &&
+        typeof result.policy.id === "string" &&
+        RESOLUTION_SOURCES.includes(result.source) &&
+        CONFIDENCE_LEVELS.includes(result.confidence) &&
+        hasJurisdiction(result.jurisdiction.id) &&
+        hasPolicy(result.policy.id)
+    );
+}
diff --git a/package.json b/package.json
new file mode 100644
index 0000000..089153b
--- /dev/null
+++ b/package.json
@@ -0,0 +1 @@
+{"type":"module"}
diff --git a/test-core.mjs b/test-core.mjs
new file mode 100644
index 0000000..86cea60
--- /dev/null
+++ b/test-core.mjs
@@ -0,0 +1,180 @@
+import assert from 'node:assert/strict';
+import {
+  createConsentEngine,
+  ENGINE_VERSION
+} from './core/consent.js';
+import { isStoragePayload } from './core/storage.js';
+import { isValidCategoriesObject } from './core/categories.js';
+
+let jar = new Map();
+let blockWrites = false;
+
+globalThis.location = { protocol: 'http:' };
+globalThis.document = {};
+Object.defineProperty(globalThis.document, 'cookie', {
+  configurable: true,
+  get() {
+    return [...jar.entries()].map(([k,v]) => `${k}=${v}`).join('; ');
+  },
+  set(value) {
+    if (blockWrites) return;
+    const parts = value.split(';').map(x => x.trim());
+    const [name, raw = ''] = parts[0].split('=');
+    const maxAge = parts.find(x => /^Max-Age=/i.test(x));
+    if (maxAge && maxAge.toLowerCase() === 'max-age=0') {
+      jar.delete(name);
+      return;
+    }
+    jar.set(name, raw);
+  }
+});
+
+function clearCookie() { jar.clear(); blockWrites = false; }
+function make() {
+  return createConsentEngine({
+    policyVersion: '2026-01',
+    jurisdiction: 'global',
+    storage: { name: 'cc_consent', duration: 180, path: '/', sameSite: 'Lax' }
+  });
+}
+
+let passed = 0;
+function test(name, fn) {
+  try { fn(); passed++; console.log(`PASS ${name}`); }
+  catch (e) { console.error(`FAIL ${name}\n`, e); process.exitCode = 1; }
+}
+
+clearCookie();
+
+test('default state is undecided', () => {
+  const e = make(); e.initialize(); const s = e.getState();
+  assert.equal(s.categories.necessary, 'granted');
+  assert.equal(s.categories.analytics, 'unknown');
+  assert.equal(s.hasDecision, false);
+});
+
+test('accept all', () => {
+  clearCookie();
+  const e = make(); e.initialize(); let changed = 0, accepted = 0;
+  e.on('consent:changed', () => changed++); e.on('consent:accepted', () => accepted++);
+  e.acceptAll();
+  assert.equal(e.getState().hasDecision, true);
+  assert.equal(e.getState().categories.analytics, 'granted');
+  assert.equal(changed, 1); assert.equal(accepted, 1);
+});
+
+test('accept all is idempotent', () => {
+  clearCookie();
+  const e = make(); e.initialize(); let events = 0; e.on('consent:changed', () => events++);
+  e.acceptAll(); const before = e.getState().timestamp; e.acceptAll();
+  assert.equal(events, 1); assert.equal(e.getState().timestamp, before);
+});
+
+test('persistence loads from storage', () => {
+  clearCookie();
+  const e = make(); e.initialize(); e.rejectAll();
+  const fresh = make(); fresh.initialize(); const s = fresh.getState();
+  assert.equal(s.source, 'storage'); assert.equal(s.categories.analytics, 'denied');
+});
+
+test('reject all is idempotent', () => {
+  clearCookie(); const e = make(); e.initialize(); let events = 0; e.on('consent:changed', () => events++);
+  e.rejectAll(); e.rejectAll(); assert.equal(events, 1);
+});
+
+test('selective consent', () => {
+  clearCookie(); const e = make(); e.initialize(); e.setConsent({ analytics: 'granted', marketing: 'denied', preferences: 'denied' });
+  assert.equal(e.getState().categories.analytics, 'granted'); assert.equal(e.isComplete(), true);
+});
+
+test('invalid consent value throws', () => {
+  clearCookie(); const e = make(); e.initialize(); assert.throws(() => e.setConsent({ analytics: 'banana' }), TypeError);
+});
+
+test('necessary cannot be denied', () => {
+  clearCookie(); const e = make(); e.initialize();
+  assert.throws(() => e.setConsent({ necessary: 'denied', analytics: 'granted' }), TypeError);
+  assert.equal(e.getState().categories.necessary, 'granted');
+  assert.equal(e.getState().categories.analytics, 'unknown');
+});
+
+test('revoke is idempotent', () => {
+  clearCookie(); const e = make(); e.initialize(); e.acceptAll(); let revoked = 0; e.on('consent:revoked', () => revoked++);
+  e.revoke(); e.revoke(); assert.equal(revoked, 1); assert.equal(e.getState().categories.analytics, 'denied');
+});
+
+test('reset removes persistence', () => {
+  clearCookie(); const e = make(); e.initialize(); e.acceptAll(); e.reset();
+  assert.equal(e.isComplete(), false); assert.equal(document.cookie, '');
+  const fresh = make(); fresh.initialize(); assert.equal(fresh.isComplete(), false); assert.equal(fresh.getState().source, 'default');
+});
+
+test('reset does not lie when storage removal fails', () => {
+  clearCookie(); const e = make(); e.initialize(); e.acceptAll(); blockWrites = true; let reset = 0, errors = 0;
+  e.on('consent:reset', () => reset++); e.on('storage:error', () => errors++);
+  const before = e.getState(); e.reset();
+  assert.equal(reset, 0); assert.equal(errors, 1); assert.equal(e.getState().categories.analytics, before.categories.analytics);
+});
+
+test('strict stored envelope validation', () => {
+  assert.equal(isStoragePayload({}), false);
+  assert.equal(isStoragePayload({ engineVersion: ENGINE_VERSION, policyVersion: '2026-01', timestamp: Date.now(), categories: {}, jurisdiction: 'global', gpc: false }), true);
+});
+
+test('strict category validation', () => {
+  assert.equal(isValidCategoriesObject({ necessary:'granted', preferences:'unknown', analytics:'granted', marketing:'denied' }), true);
+  assert.equal(isValidCategoriesObject({ necessary:'denied', preferences:'unknown', analytics:'granted', marketing:'denied' }), false);
+  assert.equal(isValidCategoriesObject({ necessary:'granted', preferences:'banana', analytics:'granted', marketing:'denied' }), false);
+});
+
+test('initialize is idempotent', () => {
+  clearCookie(); const e = make(); let initialized = 0; e.on('initialized', () => initialized++); e.initialize(); e.initialize(); assert.equal(initialized, 1);
+});
+
+test('policy mismatch removes valid cookie', () => {
+  clearCookie(); const e = make(); e.initialize(); e.acceptAll();
+  const fresh = createConsentEngine({ policyVersion:'2027-01', jurisdiction:'global', storage:{ name:'cc_consent', duration:180, path:'/', sameSite:'Lax' } });
+  fresh.initialize(); assert.equal(fresh.isComplete(), false); assert.equal(document.cookie, '');
+});
+
+test('expired cookie is rejected', () => {
+  clearCookie(); const e = make(); e.initialize(); e.acceptAll();
+  const raw = decodeURIComponent(document.cookie.split('=').slice(1).join('=')); const payload = JSON.parse(raw); payload.timestamp = Date.now() - 181*24*60*60*1000;
+  document.cookie = `cc_consent=${encodeURIComponent(JSON.stringify(payload))}; Path=/; SameSite=Lax`;
+  const fresh = make(); let expired = 0; fresh.on('consent:expired', () => expired++); fresh.initialize();
+  assert.equal(expired, 1); assert.equal(fresh.isComplete(), false); assert.equal(document.cookie, '');
+});
+
+
+test('necessary denial is explicitly rejected', () => {
+  clearCookie(); const e = make(); e.initialize();
+  assert.throws(() => e.setConsent({ necessary: 'denied' }), TypeError);
+  assert.equal(e.getState().categories.necessary, 'granted');
+});
+
+test('invalid persisted category payload is ignored and removed', () => {
+  clearCookie();
+  const bad = {
+    engineVersion: ENGINE_VERSION,
+    policyVersion: '2026-01',
+    timestamp: Date.now(),
+    categories: { necessary: 'granted', preferences: 'banana', analytics: 'granted', marketing: 'denied' },
+    jurisdiction: 'global',
+    gpc: false
+  };
+  document.cookie = `cc_consent=${encodeURIComponent(JSON.stringify(bad))}; Path=/; SameSite=Lax`;
+  const e = make(); e.initialize();
+  assert.equal(e.isComplete(), false); assert.equal(document.cookie, '');
+});
+
+test('future timestamp is rejected', () => {
+  clearCookie(); const e = make(); e.initialize(); e.acceptAll();
+  const raw = decodeURIComponent(document.cookie.split('=').slice(1).join('='));
+  const payload = JSON.parse(raw); payload.timestamp = Date.now() + 60 * 60 * 1000;
+  document.cookie = `cc_consent=${encodeURIComponent(JSON.stringify(payload))}; Path=/; SameSite=Lax`;
+  const fresh = make(); fresh.initialize();
+  assert.equal(fresh.isComplete(), false); assert.equal(document.cookie, '');
+});
+
+console.log(`\n${passed} tests passed.`);
+if (process.exitCode) process.exit(1);
diff --git a/tests/audit/audit-test.html b/tests/audit/audit-test.html
new file mode 100644
index 0000000..76b2b5d
--- /dev/null
+++ b/tests/audit/audit-test.html
@@ -0,0 +1,136 @@
+<!doctype html>
+<html lang="en">
+<head>
+    <meta charset="utf-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1">
+    <title>Cookie Consent Audit Lab</title>
+    <style>
+        body { font-family: system-ui, sans-serif; max-width: 900px; margin: 40px auto; padding: 0 20px; }
+        button { padding: 10px 16px; cursor: pointer; }
+        #status { margin: 20px 0; font-size: 1.2rem; font-weight: 700; }
+        pre { background: #f5f5f5; padding: 16px; overflow: auto; }
+    </style>
+</head>
+<body>
+    <h1>Cookie Consent Audit Lab</h1>
+    <p>Browser audit for Core + Jurisdiction + Integration invariants.</p>
+    <button id="run">Run audit</button>
+    <div id="status">Not run</div>
+    <pre id="log"></pre>
+
+    <script type="module">
+        import { createIntegratedConsentEngine } from "../../integration/index.js";
+
+        const status = document.getElementById("status");
+        const log = document.getElementById("log");
+        const button = document.getElementById("run");
+
+        function assert(condition, message) {
+            if (!condition) throw new Error(message);
+        }
+
+        function clearConsentCookie() {
+            document.cookie = "ucc_consent=; Max-Age=0; Path=/; SameSite=Lax";
+        }
+
+        async function test(name, fn, output) {
+            try {
+                await fn();
+                output.push(`PASS ${name}`);
+                return true;
+            } catch (error) {
+                output.push(`FAIL ${name} — ${error.message}`);
+                return false;
+            }
+        }
+
+        async function runAudit() {
+            clearConsentCookie();
+            const output = [];
+            let passed = 0;
+
+            if (await test("dynamic jurisdiction is reflected in Core state", () => {
+                const consent = createIntegratedConsentEngine({
+                    jurisdiction: { mode: "fixed", jurisdiction: "global" }
+                });
+                consent.initialize();
+                assert(consent.setJurisdiction("us-ma").jurisdiction === "us-ma", "jurisdiction mismatch");
+            }, output)) passed++;
+
+            if (await test("GPC state is represented without granting optional consent", () => {
+                const consent = createIntegratedConsentEngine({
+                    jurisdiction: { mode: "fixed", jurisdiction: "us-ma" }
+                });
+                consent.initialize();
+                const state = consent.setGpc(true);
+                assert(state.gpc === true, "GPC was not recorded");
+                assert(state.hasDecision === false, "GPC unexpectedly created a decision");
+                assert(state.categories.analytics === "unknown", "analytics was granted unexpectedly");
+            }, output)) passed++;
+
+            if (await test("acceptance persists resolved jurisdiction", () => {
+                clearConsentCookie();
+                const consent = createIntegratedConsentEngine({
+                    jurisdiction: { mode: "fixed", jurisdiction: "us-ma" }
+                });
+                consent.initialize();
+                const state = consent.acceptAll();
+                assert(state.hasDecision === true, "decision was not saved");
+                assert(state.jurisdiction === "us-ma", "wrong persisted jurisdiction");
+            }, output)) passed++;
+
+            if (await test("reload recovers the persisted decision", () => {
+                const consent = createIntegratedConsentEngine({
+                    jurisdiction: { mode: "fixed", jurisdiction: "us-ma" }
+                });
+                consent.initialize();
+                const state = consent.getState();
+                assert(state.hasDecision === true, "decision did not survive reinitialization");
+                assert(state.jurisdiction === "us-ma", "jurisdiction did not survive reinitialization");
+            }, output)) passed++;
+
+            if (await test("reset removes the persisted decision", () => {
+                const consent = createIntegratedConsentEngine({
+                    jurisdiction: { mode: "fixed", jurisdiction: "us-ma" }
+                });
+                consent.initialize();
+                const state = consent.reset();
+                assert(state.hasDecision === false, "reset retained decision");
+                assert(state.categories.analytics === "unknown", "analytics was not reset");
+            }, output)) passed++;
+
+            if (await test("event sequence reports acceptance once", () => {
+                clearConsentCookie();
+                const consent = createIntegratedConsentEngine({
+                    jurisdiction: { mode: "fixed", jurisdiction: "us-ma" }
+                });
+                const events = [];
+                consent.on("consent:changed", () => events.push("changed"));
+                consent.on("consent:accepted", () => events.push("accepted"));
+                consent.initialize();
+                consent.acceptAll();
+                assert(events.join(",") === "changed,accepted", "unexpected event sequence: " + events.join(","));
+            }, output)) passed++;
+
+            if (await test("returned state cannot mutate Core internals", () => {
+                const consent = createIntegratedConsentEngine({
+                    jurisdiction: { mode: "fixed", jurisdiction: "us-ma" }
+                });
+                consent.initialize();
+                const state = consent.getState();
+                state.categories.analytics = "granted";
+                state.jurisdiction = "changed";
+                const current = consent.getState();
+                assert(current.categories.analytics === "unknown", "categories leaked");
+                assert(current.jurisdiction === "us-ma", "jurisdiction leaked");
+            }, output)) passed++;
+
+            log.textContent = output.join("\n");
+            status.textContent = `${passed}/7 audit tests passed`;
+            clearConsentCookie();
+        }
+
+        button.addEventListener("click", runAudit);
+    </script>
+</body>
+</html>
diff --git a/tests/audit/audit-test.mjs b/tests/audit/audit-test.mjs
new file mode 100644
index 0000000..dd167ae
--- /dev/null
+++ b/tests/audit/audit-test.mjs
@@ -0,0 +1,256 @@
+import assert from "node:assert/strict";
+import { createIntegratedConsentEngine } from "../../integration/index.js";
+
+// This suite exercises real persistence (acceptAll/revoke/reset expected to
+// take effect), unlike tests/integration/integration-test.mjs which
+// deliberately asserts the no-op behavior of a bare Node environment.
+// A document.cookie mock is required here for the same reason it is
+// required in test-core.mjs.
+let jar = new Map();
+
+globalThis.location = { protocol: "http:" };
+globalThis.document = {};
+Object.defineProperty(globalThis.document, "cookie", {
+    configurable: true,
+    get() {
+        return [...jar.entries()].map(([k, v]) => `${k}=${v}`).join("; ");
+    },
+    set(value) {
+        const parts = value.split(";").map((x) => x.trim());
+        const [name, raw = ""] = parts[0].split("=");
+        const maxAge = parts.find((x) => /^Max-Age=/i.test(x));
+        if (maxAge && maxAge.toLowerCase() === "max-age=0") {
+            jar.delete(name);
+            return;
+        }
+        jar.set(name, raw);
+    }
+});
+
+let passed = 0;
+
+function test(name, fn) {
+    // Each test starts from a clean cookie jar so persisted consent from
+    // one test cannot leak into the next (they share default jurisdiction
+    // and policyVersion, so a stale cookie would otherwise be reloaded).
+    jar.clear();
+
+    try {
+        fn();
+        console.log(`PASS ${name}`);
+        passed += 1;
+    } catch (error) {
+        console.error(`FAIL ${name}`);
+        throw error;
+    }
+}
+
+function createEngine(jurisdiction = "us-ma") {
+    return createIntegratedConsentEngine({
+        jurisdiction: {
+            mode: "fixed",
+            jurisdiction
+        }
+    });
+}
+
+test("dynamic jurisdiction is reflected in Core state", () => {
+    const consent = createEngine("global");
+    consent.initialize();
+    const state = consent.setJurisdiction("us-ma");
+
+    assert.equal(state.jurisdiction, "us-ma");
+});
+
+test("GPC state is represented without granting optional consent", () => {
+    const consent = createEngine();
+    consent.initialize();
+    const state = consent.setGpc(true);
+
+    assert.equal(state.gpc, true);
+    assert.equal(state.hasDecision, false);
+    assert.equal(state.categories.preferences, "unknown");
+    assert.equal(state.categories.analytics, "unknown");
+    assert.equal(state.categories.marketing, "unknown");
+});
+
+test("revoke produces the Core-defined denied state and is idempotent", () => {
+    const consent = createEngine();
+    consent.initialize();
+
+consent.acceptAll();
+const accepted = consent.getState();
+assert.equal(accepted.hasDecision, true);
+
+    let revokedEvents = 0;
+    consent.on("consent:revoked", () => revokedEvents++);
+
+    const revoked = consent.revoke();
+    const secondRevoke = consent.revoke();
+
+    assert.equal(revoked.categories.necessary, "granted");
+    assert.equal(revoked.categories.preferences, "denied");
+    assert.equal(revoked.categories.analytics, "denied");
+    assert.equal(revoked.categories.marketing, "denied");
+    assert.equal(secondRevoke.categories.analytics, "denied");
+    assert.equal(revokedEvents, 1);
+});
+
+test("reset returns Core to an undecided state", () => {
+    const consent = createEngine();
+    consent.initialize();
+    consent.acceptAll();
+
+    const reset = consent.reset();
+
+    assert.equal(reset.hasDecision, false);
+    assert.equal(reset.categories.necessary, "granted");
+    assert.equal(reset.categories.preferences, "unknown");
+    assert.equal(reset.categories.analytics, "unknown");
+    assert.equal(reset.categories.marketing, "unknown");
+});
+
+test("policy version is part of the Core state", () => {
+    const consent = createEngine();
+    const config = consent.getConfig();
+
+    assert.equal(typeof config.policyVersion, "string");
+    assert.ok(config.policyVersion.length > 0);
+});
+
+test("persistence preserves the resolved jurisdiction after acceptance", () => {
+    const consent = createEngine("us-ma");
+    consent.initialize();
+
+    const saved = consent.acceptAll();
+
+    assert.equal(saved.hasDecision, true);
+    assert.equal(saved.jurisdiction, "us-ma");
+});
+
+test("event sequence reports the consent transition", () => {
+    const consent = createEngine();
+    const events = [];
+
+    consent.on("consent:changed", () => events.push("changed"));
+    consent.on("consent:accepted", () => events.push("accepted"));
+
+    consent.initialize();
+    consent.acceptAll();
+
+    assert.deepEqual(events, ["changed", "accepted"]);
+});
+
+test("Core state remains isolated from returned object mutation", () => {
+    const consent = createEngine();
+    consent.initialize();
+
+    const state = consent.getState();
+    state.categories.analytics = "granted";
+    state.jurisdiction = "changed";
+
+    const current = consent.getState();
+
+    assert.equal(current.categories.analytics, "unknown");
+    assert.equal(current.jurisdiction, "us-ma");
+});
+
+
+test("separate Core instances do not share in-memory state", () => {
+    const first = createEngine("us-ma");
+    const second = createEngine("eu");
+
+    first.initialize();
+    second.initialize();
+
+    first.setConsent({ analytics: "granted" });
+
+    assert.equal(first.getState().categories.analytics, "granted");
+    assert.equal(second.getState().categories.analytics, "unknown");
+    assert.equal(first.getState().jurisdiction, "us-ma");
+    assert.equal(second.getState().jurisdiction, "eu");
+});
+
+test("partial consent remains undecided until all optional categories are resolved", () => {
+    const consent = createEngine();
+    consent.initialize();
+
+    const state = consent.setConsent({ analytics: "granted" });
+
+    assert.equal(state.categories.analytics, "granted");
+    assert.equal(state.categories.preferences, "unknown");
+    assert.equal(state.categories.marketing, "unknown");
+    assert.equal(state.hasDecision, false);
+    assert.equal(consent.isComplete(), false);
+});
+
+test("necessary remains granted through valid consent changes", () => {
+    const consent = createEngine();
+    consent.initialize();
+
+    const state = consent.setConsent({
+        preferences: "denied",
+        analytics: "granted",
+        marketing: "denied"
+    });
+
+    assert.equal(state.categories.necessary, "granted");
+    assert.equal(state.categories.preferences, "denied");
+    assert.equal(state.categories.analytics, "granted");
+    assert.equal(state.categories.marketing, "denied");
+});
+
+test("acceptAll is idempotent through the integration boundary", () => {
+    const consent = createEngine();
+    consent.initialize();
+
+    let changed = 0;
+    let accepted = 0;
+
+    consent.on("consent:changed", () => changed++);
+    consent.on("consent:accepted", () => accepted++);
+
+    consent.acceptAll();
+    const first = consent.getState();
+    consent.acceptAll();
+    const second = consent.getState();
+
+    assert.equal(first.hasDecision, true);
+    assert.equal(second.hasDecision, true);
+    assert.equal(changed, 1);
+    assert.equal(accepted, 1);
+    assert.equal(second.timestamp, first.timestamp);
+});
+
+test("reset is idempotent through the integration boundary", () => {
+    const consent = createEngine();
+    consent.initialize();
+    consent.acceptAll();
+
+    let reset = 0;
+    consent.on("consent:reset", () => reset++);
+
+    consent.reset();
+    const first = consent.getState();
+    consent.reset();
+    const second = consent.getState();
+
+    assert.equal(first.hasDecision, false);
+    assert.equal(second.hasDecision, false);
+    assert.equal(second.categories.analytics, "unknown");
+});
+
+test("GPC never grants optional categories through the integration boundary", () => {
+    const consent = createEngine();
+    consent.initialize();
+
+    const state = consent.setGpc(true);
+
+    assert.equal(state.gpc, true);
+    assert.equal(state.categories.preferences, "unknown");
+    assert.equal(state.categories.analytics, "unknown");
+    assert.equal(state.categories.marketing, "unknown");
+    assert.equal(state.hasDecision, false);
+});
+
+console.log(`${passed} audit tests passed.`);
diff --git a/tests/integration/integration-test.html b/tests/integration/integration-test.html
new file mode 100644
index 0000000..284eaec
--- /dev/null
+++ b/tests/integration/integration-test.html
@@ -0,0 +1,173 @@
+<!doctype html>
+<html lang="en">
+<head>
+    <meta charset="utf-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1">
+    <title>Cookie Consent Integration Test Lab</title>
+    <style>
+        body {
+            font-family: system-ui, sans-serif;
+            max-width: 900px;
+            margin: 40px auto;
+            padding: 0 20px;
+            line-height: 1.5;
+        }
+        button {
+            padding: 10px 16px;
+            cursor: pointer;
+        }
+        #summary {
+            font-weight: 700;
+            margin: 20px 0;
+        }
+        .pass { color: #176b2c; }
+        .fail { color: #a11; }
+        pre {
+            background: #f5f5f5;
+            padding: 16px;
+            overflow: auto;
+        }
+    </style>
+</head>
+<body>
+    <h1>Cookie Consent Integration Test Lab</h1>
+    <p>Browser regression suite for the Jurisdiction Engine + Consent Core boundary.</p>
+
+    <button id="run">Run tests</button>
+    <div id="summary">Not run.</div>
+    <pre id="output"></pre>
+
+    <script type="module">
+        import {
+            resolveConsentContext,
+            createIntegratedConsentEngine
+        } from "../../integration/index.js";
+
+        const output = document.getElementById("output");
+        const summary = document.getElementById("summary");
+        const runButton = document.getElementById("run");
+
+        function equal(actual, expected) {
+            if (actual !== expected) {
+                throw new Error(`Expected ${expected}, got ${actual}`);
+            }
+        }
+
+        function deepEqual(actual, expected) {
+            if (JSON.stringify(actual) !== JSON.stringify(expected)) {
+                throw new Error("Values are not deeply equal.");
+            }
+        }
+
+        function throws(fn, pattern) {
+            try {
+                fn();
+            } catch (error) {
+                if (pattern.test(error.message)) return;
+                throw error;
+            }
+            throw new Error("Expected function to throw.");
+        }
+
+        function test(name, fn) {
+            try {
+                fn();
+                output.textContent += `PASS: ${name}\n`;
+                return true;
+            } catch (error) {
+                output.textContent += `FAIL: ${name}\n${error.stack || error}\n`;
+                return false;
+            }
+        }
+
+        runButton.addEventListener("click", () => {
+            output.textContent = "";
+            let passed = 0;
+            const total = 9;
+
+            if (test("fixed us-ma resolves into Core context", () => {
+                const context = resolveConsentContext({
+                    mode: "fixed", jurisdiction: "us-ma"
+                });
+                equal(context.resolution.jurisdiction.id, "us-ma");
+                equal(context.resolution.policy.id, "us-state-privacy");
+            })) passed++;
+
+            if (test("fixed eu resolves into Core context", () => {
+                const context = resolveConsentContext({
+                    mode: "fixed", jurisdiction: "eu"
+                });
+                equal(context.resolution.jurisdiction.id, "eu");
+                equal(context.resolution.policy.id, "eu-privacy");
+            })) passed++;
+
+            if (test("global resolves into global baseline", () => {
+                const context = resolveConsentContext({ mode: "global" });
+                equal(context.resolution.jurisdiction.id, "global");
+                equal(context.resolution.policy.id, "global-baseline");
+            })) passed++;
+
+            if (test("integration configures Core jurisdiction", () => {
+                const consent = createIntegratedConsentEngine({
+                    jurisdiction: { mode: "fixed", jurisdiction: "us-ma" }
+                });
+                const state = consent.initialize();
+                equal(state.jurisdiction, "us-ma");
+                equal(state.hasDecision, false);
+            })) passed++;
+
+            if (test("jurisdiction does not grant consent", () => {
+                const consent = createIntegratedConsentEngine({
+                    jurisdiction: { mode: "fixed", jurisdiction: "us-ma" }
+                });
+                const state = consent.initialize();
+                equal(state.categories.necessary, "granted");
+                equal(state.categories.preferences, "unknown");
+                equal(state.categories.analytics, "unknown");
+                equal(state.categories.marketing, "unknown");
+                equal(state.hasDecision, false);
+            })) passed++;
+
+            if (test("resolved context is exposed as frozen data", () => {
+                const consent = createIntegratedConsentEngine({
+                    jurisdiction: { mode: "fixed", jurisdiction: "eu" }
+                });
+                const context = consent.getJurisdictionContext();
+                equal(context.resolution.jurisdiction.id, "eu");
+                equal(Object.isFrozen(context), true);
+            })) passed++;
+
+            if (test("Core persistence uses resolved jurisdiction", () => {
+                const consent = createIntegratedConsentEngine({
+                    jurisdiction: { mode: "fixed", jurisdiction: "us-ma" }
+                });
+                consent.initialize();
+                consent.acceptAll();
+                equal(consent.getState().jurisdiction, "us-ma");
+                equal(consent.getState().hasDecision, true);
+            })) passed++;
+
+            if (test("integration is deterministic", () => {
+                const input = {
+                    mode: "auto",
+                    request: { jurisdiction: "us-ma", source: "server" },
+                    visitor: { jurisdiction: "eu", source: "browser" }
+                };
+                deepEqual(
+                    resolveConsentContext(input),
+                    resolveConsentContext(input)
+                );
+            })) passed++;
+
+            if (test("invalid jurisdiction remains an Engine error", () => {
+                throws(() => resolveConsentContext({
+                    mode: "fixed", jurisdiction: "not-a-jurisdiction"
+                }), /Unknown jurisdiction/);
+            })) passed++;
+
+            summary.textContent = `${passed}/${total} tests passed`;
+            summary.className = passed === total ? "pass" : "fail";
+        });
+    </script>
+</body>
+</html>
diff --git a/tests/integration/integration-test.mjs b/tests/integration/integration-test.mjs
new file mode 100644
index 0000000..b9ce2a0
--- /dev/null
+++ b/tests/integration/integration-test.mjs
@@ -0,0 +1,136 @@
+import assert from "node:assert/strict";
+
+import {
+    resolveConsentContext,
+    createIntegratedConsentEngine
+} from "../../integration/index.js";
+
+function test(name, fn) {
+    try {
+        fn();
+        console.log(`PASS ${name}`);
+    } catch (error) {
+        console.error(`FAIL ${name}`);
+        throw error;
+    }
+}
+
+test("fixed us-ma resolves into Core context", () => {
+    const context = resolveConsentContext({
+        mode: "fixed",
+        jurisdiction: "us-ma"
+    });
+
+    assert.equal(context.resolution.jurisdiction.id, "us-ma");
+    assert.equal(context.resolution.policy.id, "us-state-privacy");
+});
+
+test("fixed eu resolves into Core context", () => {
+    const context = resolveConsentContext({
+        mode: "fixed",
+        jurisdiction: "eu"
+    });
+
+    assert.equal(context.resolution.jurisdiction.id, "eu");
+    assert.equal(context.resolution.policy.id, "eu-privacy");
+});
+
+test("global resolves into global baseline", () => {
+    const context = resolveConsentContext({ mode: "global" });
+
+    assert.equal(context.resolution.jurisdiction.id, "global");
+    assert.equal(context.resolution.policy.id, "global-baseline");
+});
+
+test("integration configures Core jurisdiction", () => {
+    const consent = createIntegratedConsentEngine({
+        jurisdiction: { mode: "fixed", jurisdiction: "us-ma" }
+    });
+
+    const state = consent.initialize();
+
+    assert.equal(state.jurisdiction, "us-ma");
+    assert.equal(state.hasDecision, false);
+});
+
+test("jurisdiction does not grant consent", () => {
+    const consent = createIntegratedConsentEngine({
+        jurisdiction: { mode: "fixed", jurisdiction: "us-ma" }
+    });
+
+    const state = consent.initialize();
+
+    assert.equal(state.categories.necessary, "granted");
+    assert.equal(state.categories.preferences, "unknown");
+    assert.equal(state.categories.analytics, "unknown");
+    assert.equal(state.categories.marketing, "unknown");
+    assert.equal(state.hasDecision, false);
+});
+
+test("resolved context is exposed without mutable internals", () => {
+    const consent = createIntegratedConsentEngine({
+        jurisdiction: { mode: "fixed", jurisdiction: "eu" }
+    });
+
+    const context = consent.getJurisdictionContext();
+
+    assert.equal(context.resolution.jurisdiction.id, "eu");
+    assert.equal(Object.isFrozen(context), true);
+    assert.equal(Object.isFrozen(context.resolution), true);
+});
+
+test("Core configuration preserves resolved jurisdiction", () => {
+    const consent = createIntegratedConsentEngine({
+        jurisdiction: { mode: "fixed", jurisdiction: "us-ma" }
+    });
+
+    const config = consent.getConfig();
+
+    assert.equal(config.jurisdiction, "us-ma");
+});
+
+test("Node environment does not fake successful persistence", () => {
+    const consent = createIntegratedConsentEngine({
+        jurisdiction: { mode: "fixed", jurisdiction: "us-ma" }
+    });
+
+    consent.initialize();
+    const state = consent.acceptAll();
+
+    assert.equal(state.jurisdiction, "us-ma");
+    assert.equal(state.hasDecision, false);
+    assert.equal(state.categories.preferences, "unknown");
+    assert.equal(state.categories.analytics, "unknown");
+    assert.equal(state.categories.marketing, "unknown");
+});
+
+test("integration remains deterministic", () => {
+    const input = {
+        mode: "auto",
+        request: {
+            jurisdiction: "us-ma",
+            source: "server"
+        },
+        visitor: {
+            jurisdiction: "eu",
+            source: "browser"
+        }
+    };
+
+    const first = resolveConsentContext(input);
+    const second = resolveConsentContext(input);
+
+    assert.deepEqual(first, second);
+});
+
+test("invalid jurisdiction remains an Engine error", () => {
+    assert.throws(
+        () => resolveConsentContext({
+            mode: "fixed",
+            jurisdiction: "not-a-jurisdiction"
+        }),
+        /Unknown jurisdiction/
+    );
+});
+
+console.log("10 integration tests passed.");
diff --git a/tests/jurisdiction-test.html b/tests/jurisdiction-test.html
new file mode 100644
index 0000000..11eec65
--- /dev/null
+++ b/tests/jurisdiction-test.html
@@ -0,0 +1,84 @@
+<!doctype html>
+<html lang="en">
+<head>
+    <meta charset="utf-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1">
+    <title>Jurisdiction Engine Test Lab</title>
+    <style>
+        body { font-family: system-ui, sans-serif; max-width: 900px; margin: 40px auto; padding: 0 20px; }
+        button { padding: 10px 16px; cursor: pointer; }
+        #summary { margin: 20px 0; font-weight: 700; }
+        .pass { color: #176b2c; }
+        .fail { color: #a51d2d; }
+        pre { white-space: pre-wrap; background: #f5f5f5; padding: 16px; border-radius: 8px; }
+    </style>
+</head>
+<body>
+    <h1>Jurisdiction Engine Test Lab</h1>
+    <p>Browser regression suite for the pure Jurisdiction Engine.</p>
+    <button id="run">Run tests</button>
+    <div id="summary">Not run.</div>
+    <pre id="log"></pre>
+
+<script type="module">
+import {
+    resolveJurisdiction,
+    isValidResolution,
+    getResolutionPriority,
+    getSourceConfidence,
+    hasJurisdiction,
+    hasPolicy,
+    JURISDICTION_CATALOG,
+    POLICIES
+} from "../jurisdiction/index.js";
+
+const tests = [
+    ["fixed us-ma", () => {
+        const r = resolveJurisdiction({mode:"fixed", jurisdiction:"us-ma"});
+        return r.status === "resolved" && r.jurisdiction.id === "us-ma" && r.policy.id === "us-state-privacy" && r.source === "site-config" && r.confidence === "explicit";
+    }],
+    ["fixed eu", () => resolveJurisdiction({mode:"fixed", jurisdiction:"eu"}).policy.id === "eu-privacy"],
+    ["fixed global", () => resolveJurisdiction({mode:"fixed", jurisdiction:"global"}).policy.id === "global-baseline"],
+    ["global mode", () => resolveJurisdiction({mode:"global"}).jurisdiction.id === "global"],
+    ["auto server", () => resolveJurisdiction({mode:"auto", request:{jurisdiction:"us-ca", source:"server"}}).source === "server"],
+    ["auto application", () => resolveJurisdiction({mode:"auto", visitor:{jurisdiction:"us-ma", source:"application"}}).source === "application"],
+    ["auto browser", () => resolveJurisdiction({mode:"auto", visitor:{jurisdiction:"eu", source:"browser"}}).source === "browser"],
+    ["auto fallback", () => { const r=resolveJurisdiction({mode:"auto"}); return r.status === "fallback" && r.jurisdiction.id === "global"; }],
+    ["unknown signal fallback", () => resolveJurisdiction({mode:"auto", request:{jurisdiction:"xx-unknown", source:"server"}}).status === "fallback"],
+    ["server beats browser", () => resolveJurisdiction({mode:"auto", request:{jurisdiction:"us-ma",source:"server"}, visitor:{jurisdiction:"eu",source:"browser"}}).jurisdiction.id === "us-ma"],
+    ["site config beats server", () => resolveJurisdiction({mode:"auto", site:{jurisdiction:"us-ca",source:"site-config"}, request:{jurisdiction:"eu",source:"server"}}).jurisdiction.id === "us-ca"],
+    ["fixed requires jurisdiction", () => { try { resolveJurisdiction({mode:"fixed"}); return false; } catch { return true; } }],
+    ["fixed rejects unknown", () => { try { resolveJurisdiction({mode:"fixed",jurisdiction:"xx"}); return false; } catch { return true; } }],
+    ["invalid mode", () => { try { resolveJurisdiction({mode:"random"}); return false; } catch { return true; } }],
+    ["invalid input", () => { try { resolveJurisdiction(null); return false; } catch { return true; } }],
+    ["catalog policies exist", () => Object.values(JURISDICTION_CATALOG).every(e => hasPolicy(e.policy))],
+    ["result contract", () => [resolveJurisdiction({mode:"fixed",jurisdiction:"us-ma"}),resolveJurisdiction({mode:"global"}),resolveJurisdiction({mode:"auto"})].every(isValidResolution)],
+    ["source priority", () => getResolutionPriority("site-config") > getResolutionPriority("server") && getResolutionPriority("server") > getResolutionPriority("application") && getResolutionPriority("application") > getResolutionPriority("browser") && getResolutionPriority("browser") > getResolutionPriority("fallback")],
+    ["confidence mapping", () => getSourceConfidence("site-config") === "explicit" && getSourceConfidence("server") === "high" && getSourceConfidence("application") === "medium" && getSourceConfidence("browser") === "low" && getSourceConfidence("fallback") === "default"],
+    ["initial catalog", () => ["global","us","us-ma","us-ca","eu"].every(hasJurisdiction) && POLICIES["global-baseline"] !== undefined]
+];
+
+const run = document.querySelector("#run");
+const summary = document.querySelector("#summary");
+const log = document.querySelector("#log");
+
+run.addEventListener("click", () => {
+    let passed = 0;
+    const lines = [];
+    for (const [name, fn] of tests) {
+        try {
+            const ok = Boolean(fn());
+            if (!ok) throw new Error("Assertion returned false");
+            passed++;
+            lines.push(`PASS: ${name}`);
+        } catch (error) {
+            lines.push(`FAIL: ${name} — ${error.message}`);
+        }
+    }
+    summary.textContent = `${passed}/${tests.length} tests passed`;
+    summary.className = passed === tests.length ? "pass" : "fail";
+    log.textContent = lines.join("\n");
+});
+</script>
+</body>
+</html>
diff --git a/tests/jurisdiction-test.mjs b/tests/jurisdiction-test.mjs
new file mode 100644
index 0000000..5ed9087
--- /dev/null
+++ b/tests/jurisdiction-test.mjs
@@ -0,0 +1,196 @@
+import assert from "node:assert/strict";
+import {
+    resolveJurisdiction,
+    isValidResolution,
+    getResolutionPriority,
+    getSourceConfidence,
+    hasJurisdiction,
+    hasPolicy,
+    JURISDICTION_CATALOG,
+    POLICIES
+} from "../jurisdiction/index.js";
+
+const tests = [];
+function test(name, fn) {
+    tests.push({ name, fn });
+}
+
+test("fixed us-ma resolves from site configuration", () => {
+    const result = resolveJurisdiction({ mode: "fixed", jurisdiction: "us-ma" });
+    assert.equal(result.status, "resolved");
+    assert.equal(result.jurisdiction.id, "us-ma");
+    assert.equal(result.policy.id, "us-state-privacy");
+    assert.equal(result.source, "site-config");
+    assert.equal(result.confidence, "explicit");
+});
+
+test("fixed eu resolves correctly", () => {
+    const result = resolveJurisdiction({ mode: "fixed", jurisdiction: "eu" });
+    assert.equal(result.jurisdiction.id, "eu");
+    assert.equal(result.policy.id, "eu-privacy");
+});
+
+test("fixed global resolves global baseline", () => {
+    const result = resolveJurisdiction({ mode: "fixed", jurisdiction: "global" });
+    assert.equal(result.jurisdiction.id, "global");
+    assert.equal(result.policy.id, "global-baseline");
+});
+
+test("global mode deliberately selects global policy", () => {
+    const result = resolveJurisdiction({ mode: "global" });
+    assert.equal(result.jurisdiction.id, "global");
+    assert.equal(result.source, "site-config");
+});
+
+test("auto resolves server signal", () => {
+    const result = resolveJurisdiction({
+        mode: "auto",
+        request: { jurisdiction: "us-ca", source: "server" }
+    });
+    assert.equal(result.jurisdiction.id, "us-ca");
+    assert.equal(result.source, "server");
+    assert.equal(result.confidence, "high");
+});
+
+test("auto resolves application signal", () => {
+    const result = resolveJurisdiction({
+        mode: "auto",
+        visitor: { jurisdiction: "us-ma", source: "application" }
+    });
+    assert.equal(result.jurisdiction.id, "us-ma");
+    assert.equal(result.source, "application");
+});
+
+test("auto resolves browser signal", () => {
+    const result = resolveJurisdiction({
+        mode: "auto",
+        visitor: { jurisdiction: "eu", source: "browser" }
+    });
+    assert.equal(result.jurisdiction.id, "eu");
+    assert.equal(result.source, "browser");
+    assert.equal(result.confidence, "low");
+});
+
+test("auto falls back conservatively when no signal exists", () => {
+    const result = resolveJurisdiction({ mode: "auto" });
+    assert.equal(result.status, "fallback");
+    assert.equal(result.jurisdiction.id, "global");
+    assert.equal(result.policy.id, "global-baseline");
+    assert.equal(result.source, "fallback");
+    assert.equal(result.confidence, "default");
+});
+
+test("auto ignores unknown jurisdiction signals", () => {
+    const result = resolveJurisdiction({
+        mode: "auto",
+        request: { jurisdiction: "xx-unknown", source: "server" }
+    });
+    assert.equal(result.status, "fallback");
+    assert.equal(result.jurisdiction.id, "global");
+});
+
+test("higher-trust server signal wins over browser signal", () => {
+    const result = resolveJurisdiction({
+        mode: "auto",
+        request: { jurisdiction: "us-ma", source: "server" },
+        visitor: { jurisdiction: "eu", source: "browser" }
+    });
+    assert.equal(result.jurisdiction.id, "us-ma");
+    assert.equal(result.source, "server");
+});
+
+test("explicit site configuration wins over lower-trust signals", () => {
+    const result = resolveJurisdiction({
+        mode: "auto",
+        site: { jurisdiction: "us-ca", source: "site-config" },
+        request: { jurisdiction: "eu", source: "server" }
+    });
+    assert.equal(result.jurisdiction.id, "us-ca");
+    assert.equal(result.source, "site-config");
+});
+
+test("fixed mode requires jurisdiction", () => {
+    assert.throws(
+        () => resolveJurisdiction({ mode: "fixed" }),
+        /jurisdiction is required/i
+    );
+});
+
+test("fixed mode rejects unknown jurisdiction", () => {
+    assert.throws(
+        () => resolveJurisdiction({ mode: "fixed", jurisdiction: "xx" }),
+        /unknown jurisdiction/i
+    );
+});
+
+test("invalid mode is rejected", () => {
+    assert.throws(
+        () => resolveJurisdiction({ mode: "random" }),
+        /invalid jurisdiction mode/i
+    );
+});
+
+test("invalid input type is rejected", () => {
+    assert.throws(
+        () => resolveJurisdiction(null),
+        /input must be an object/i
+    );
+});
+
+test("catalog entries reference existing policies", () => {
+    for (const entry of Object.values(JURISDICTION_CATALOG)) {
+        assert.equal(hasPolicy(entry.policy), true);
+    }
+});
+
+test("resolution result satisfies its contract", () => {
+    const results = [
+        resolveJurisdiction({ mode: "fixed", jurisdiction: "us-ma" }),
+        resolveJurisdiction({ mode: "global" }),
+        resolveJurisdiction({ mode: "auto" })
+    ];
+
+    for (const result of results) {
+        assert.equal(isValidResolution(result), true);
+    }
+});
+
+test("source priority is deterministic", () => {
+    assert.ok(getResolutionPriority("site-config") > getResolutionPriority("server"));
+    assert.ok(getResolutionPriority("server") > getResolutionPriority("application"));
+    assert.ok(getResolutionPriority("application") > getResolutionPriority("browser"));
+    assert.ok(getResolutionPriority("browser") > getResolutionPriority("fallback"));
+});
+
+test("source confidence mapping is deterministic", () => {
+    assert.equal(getSourceConfidence("site-config"), "explicit");
+    assert.equal(getSourceConfidence("server"), "high");
+    assert.equal(getSourceConfidence("application"), "medium");
+    assert.equal(getSourceConfidence("browser"), "low");
+    assert.equal(getSourceConfidence("fallback"), "default");
+});
+
+test("catalog contains the initial architectural jurisdictions", () => {
+    for (const id of ["global", "us", "us-ma", "us-ca", "eu"]) {
+        assert.equal(hasJurisdiction(id), true);
+    }
+    assert.equal(POLICIES["global-baseline"] !== undefined, true);
+});
+
+let passed = 0;
+for (const { name, fn } of tests) {
+    try {
+        fn();
+        passed += 1;
+        console.log(`PASS: ${name}`);
+    } catch (error) {
+        console.error(`FAIL: ${name}`);
+        console.error(error);
+        process.exitCode = 1;
+    }
+}
+
+console.log(`\n${passed}/${tests.length} tests passed`);
+if (passed !== tests.length) {
+    process.exitCode = 1;
+}
diff --git a/tests/reliability/reliability-test.mjs b/tests/reliability/reliability-test.mjs
new file mode 100644
index 0000000..7356a56
--- /dev/null
+++ b/tests/reliability/reliability-test.mjs
@@ -0,0 +1,525 @@
+import assert from "node:assert/strict";
+
+import { createConsentEngine } from "../../core/consent.js";
+import {
+    isStoragePayload
+} from "../../core/storage.js";
+import {
+    isValidCategoriesObject
+} from "../../core/categories.js";
+
+let jar = new Map();
+let blockWrites = false;
+
+globalThis.location = { protocol: "http:" };
+globalThis.document = {};
+
+Object.defineProperty(globalThis.document, "cookie", {
+    configurable: true,
+
+    get() {
+        return [...jar.entries()]
+            .map(([key, value]) => `${key}=${value}`)
+            .join("; ");
+    },
+
+    set(value) {
+        if (blockWrites) {
+            return;
+        }
+
+        const parts = value.split(";").map((item) => item.trim());
+        const [name, raw = ""] = parts[0].split("=");
+
+        const maxAge = parts.find((item) => /^Max-Age=/i.test(item));
+
+        if (maxAge && maxAge.toLowerCase() === "max-age=0") {
+            jar.delete(name);
+            return;
+        }
+
+        jar.set(name, raw);
+    }
+});
+
+function clearEnvironment() {
+    jar.clear();
+    blockWrites = false;
+}
+
+function make(options = {}) {
+    return createConsentEngine({
+        policyVersion: "2026-01",
+        jurisdiction: "global",
+        storage: {
+            name: "cc_reliability",
+            duration: 180,
+            path: "/",
+            sameSite: "Lax"
+        },
+        ...options
+    });
+}
+
+let passed = 0;
+
+function test(name, fn) {
+    clearEnvironment();
+
+    try {
+        fn();
+        passed += 1;
+        console.log(`PASS ${name}`);
+    } catch (error) {
+        console.error(`FAIL ${name}`);
+        throw error;
+    }
+}
+
+
+/* -------------------------------------------------------------------------- */
+/* Input contract                                                              */
+/* -------------------------------------------------------------------------- */
+
+test("engine accepts omitted configuration and applies defaults", () => {
+    const consent = createConsentEngine();
+
+    consent.initialize();
+
+    const state = consent.getState();
+
+    assert.equal(state.hasDecision, false);
+    assert.equal(state.categories.necessary, "granted");
+    assert.equal(state.categories.preferences, "unknown");
+    assert.equal(state.categories.analytics, "unknown");
+    assert.equal(state.categories.marketing, "unknown");
+});
+
+test("rejects invalid consent category value", () => {
+    const consent = make();
+
+    consent.initialize();
+
+    assert.throws(
+        () => consent.setConsent({
+            analytics: "invalid"
+        }),
+        TypeError
+    );
+});
+
+test("rejects denial of necessary category", () => {
+    const consent = make();
+
+    consent.initialize();
+
+    assert.throws(
+        () => consent.setConsent({
+            necessary: "denied"
+        }),
+        TypeError
+    );
+});
+
+
+/* -------------------------------------------------------------------------- */
+/* State isolation                                                             */
+/* -------------------------------------------------------------------------- */
+
+test("separate engines do not share state", () => {
+    const first = make();
+    const second = make();
+
+    first.initialize();
+    second.initialize();
+
+    first.acceptAll();
+
+    assert.equal(first.getState().hasDecision, true);
+    assert.equal(second.getState().hasDecision, false);
+});
+
+test("returned state mutation cannot alter internal categories", () => {
+    const consent = make();
+
+    consent.initialize();
+
+    const state = consent.getState();
+
+    state.categories.analytics = "granted";
+    state.categories.marketing = "granted";
+
+    const current = consent.getState();
+
+    assert.equal(current.categories.analytics, "unknown");
+    assert.equal(current.categories.marketing, "unknown");
+});
+
+test("returned state mutation cannot alter jurisdiction", () => {
+    const consent = make({
+        jurisdiction: "us-ma"
+    });
+
+    consent.initialize();
+
+    const state = consent.getState();
+
+    state.jurisdiction = "eu";
+
+    assert.equal(
+        consent.getState().jurisdiction,
+        "us-ma"
+    );
+});
+
+
+/* -------------------------------------------------------------------------- */
+/* Consent transitions                                                         */
+/* -------------------------------------------------------------------------- */
+
+test("partial consent does not become a complete decision", () => {
+    const consent = make();
+
+    consent.initialize();
+
+    const state = consent.setConsent({
+        analytics: "granted"
+    });
+
+    assert.equal(state.categories.analytics, "granted");
+    assert.equal(state.categories.preferences, "unknown");
+    assert.equal(state.categories.marketing, "unknown");
+    assert.equal(state.hasDecision, false);
+});
+
+test("complete selective consent creates a decision", () => {
+    const consent = make();
+
+    consent.initialize();
+
+    const state = consent.setConsent({
+        preferences: "denied",
+        analytics: "granted",
+        marketing: "denied"
+    });
+
+    assert.equal(state.hasDecision, true);
+    assert.equal(state.categories.necessary, "granted");
+});
+
+test("acceptAll is idempotent", () => {
+    const consent = make();
+
+    consent.initialize();
+
+    let changed = 0;
+    let accepted = 0;
+
+    consent.on("consent:changed", () => changed++);
+    consent.on("consent:accepted", () => accepted++);
+
+    const first = consent.acceptAll();
+    const second = consent.acceptAll();
+
+    assert.equal(first.hasDecision, true);
+    assert.equal(second.hasDecision, true);
+    assert.equal(changed, 1);
+    assert.equal(accepted, 1);
+    assert.equal(second.timestamp, first.timestamp);
+});
+
+test("rejectAll is idempotent", () => {
+    const consent = make();
+
+    consent.initialize();
+
+    let changed = 0;
+    let rejected = 0;
+
+    consent.on("consent:changed", () => changed++);
+    consent.on("consent:rejected", () => rejected++);
+
+    const first = consent.rejectAll();
+    const second = consent.rejectAll();
+
+    assert.equal(first.hasDecision, true);
+    assert.equal(second.hasDecision, true);
+    assert.equal(changed, 1);
+    assert.equal(rejected, 1);
+});
+
+test("revoke after acceptance creates the Core-defined denied state", () => {
+    const consent = make();
+
+    consent.initialize();
+    consent.acceptAll();
+
+    let revoked = 0;
+
+    consent.on("consent:revoked", () => revoked++);
+
+    const first = consent.revoke();
+    const second = consent.revoke();
+
+    assert.equal(first.categories.necessary, "granted");
+    assert.equal(first.categories.preferences, "denied");
+    assert.equal(first.categories.analytics, "denied");
+    assert.equal(first.categories.marketing, "denied");
+
+    assert.equal(second.categories.analytics, "denied");
+    assert.equal(revoked, 1);
+});
+
+test("reset returns the engine to undecided state", () => {
+    const consent = make();
+
+    consent.initialize();
+    consent.acceptAll();
+
+    const state = consent.reset();
+
+    assert.equal(state.hasDecision, false);
+    assert.equal(state.categories.necessary, "granted");
+    assert.equal(state.categories.preferences, "unknown");
+    assert.equal(state.categories.analytics, "unknown");
+    assert.equal(state.categories.marketing, "unknown");
+});
+
+test("reset is idempotent", () => {
+    const consent = make();
+
+    consent.initialize();
+
+    let reset = 0;
+
+    consent.on("consent:reset", () => reset++);
+
+    const first = consent.reset();
+    const second = consent.reset();
+
+    assert.equal(first.hasDecision, false);
+    assert.equal(second.hasDecision, false);
+    assert.equal(reset, 2);
+});
+
+/* -------------------------------------------------------------------------- */
+/* GPC                                                                         */
+/* -------------------------------------------------------------------------- */
+
+test("GPC never grants optional consent", () => {
+    const consent = make();
+
+    consent.initialize();
+
+    const state = consent.setGpc(true);
+
+    assert.equal(state.gpc, true);
+    assert.equal(state.hasDecision, false);
+    assert.equal(state.categories.preferences, "unknown");
+    assert.equal(state.categories.analytics, "unknown");
+    assert.equal(state.categories.marketing, "unknown");
+});
+
+test("GPC can coexist with explicit consent without changing categories", () => {
+    const consent = make();
+
+    consent.initialize();
+
+    consent.acceptAll();
+
+    const state = consent.setGpc(true);
+
+    assert.equal(state.gpc, true);
+    assert.equal(state.categories.analytics, "granted");
+    assert.equal(state.categories.marketing, "granted");
+});
+
+
+/* -------------------------------------------------------------------------- */
+/* Persistence                                                                 */
+/* -------------------------------------------------------------------------- */
+
+test("accepted consent survives a fresh engine instance", () => {
+    const first = make();
+
+    first.initialize();
+    first.acceptAll();
+
+    const second = make();
+
+    second.initialize();
+
+    const state = second.getState();
+
+    assert.equal(state.source, "storage");
+    assert.equal(state.hasDecision, true);
+    assert.equal(state.categories.analytics, "granted");
+});
+
+test("rejected consent survives a fresh engine instance", () => {
+    const first = make();
+
+    first.initialize();
+    first.rejectAll();
+
+    const second = make();
+
+    second.initialize();
+
+    assert.equal(
+        second.getState().categories.analytics,
+        "denied"
+    );
+});
+
+test("policy mismatch invalidates persisted consent", () => {
+    const first = make();
+
+    first.initialize();
+    first.acceptAll();
+
+    const second = make({
+        policyVersion: "2027-01"
+    });
+
+    second.initialize();
+
+    assert.equal(second.isComplete(), false);
+    assert.equal(document.cookie, "");
+});
+
+test("invalid persisted payload is ignored and removed", () => {
+    const bad = {
+        engineVersion: "invalid",
+        policyVersion: "2026-01",
+        timestamp: Date.now(),
+        categories: {
+            necessary: "granted",
+            preferences: "banana",
+            analytics: "granted",
+            marketing: "denied"
+        },
+        jurisdiction: "global",
+        gpc: false
+    };
+
+    document.cookie =
+        `cc_reliability=${encodeURIComponent(JSON.stringify(bad))}; Path=/; SameSite=Lax`;
+
+    const consent = make();
+
+    consent.initialize();
+
+    assert.equal(consent.isComplete(), false);
+    assert.equal(document.cookie, "");
+});
+test("storage removal failure does not falsely report reset", () => {
+    const consent = make();
+
+    consent.initialize();
+    consent.acceptAll();
+
+    blockWrites = true;
+
+    let resetEvents = 0;
+    let storageErrors = 0;
+
+    consent.on("consent:reset", () => resetEvents++);
+    consent.on("storage:error", () => storageErrors++);
+
+    consent.reset();
+
+    assert.equal(resetEvents, 0);
+    assert.equal(storageErrors, 1);
+    assert.equal(consent.getState().hasDecision, true);
+});
+
+
+/* -------------------------------------------------------------------------- */
+/* Data contracts                                                              */
+/* -------------------------------------------------------------------------- */
+
+test("valid categories object satisfies its contract", () => {
+    assert.equal(
+        isValidCategoriesObject({
+            necessary: "granted",
+            preferences: "unknown",
+            analytics: "granted",
+            marketing: "denied"
+        }),
+        true
+    );
+});
+
+test("invalid categories object fails its contract", () => {
+    assert.equal(
+        isValidCategoriesObject({
+            necessary: "granted",
+            preferences: "invalid",
+            analytics: "granted",
+            marketing: "denied"
+        }),
+        false
+    );
+});
+
+test("valid stored envelope satisfies its contract", () => {
+    assert.equal(
+        isStoragePayload({
+            engineVersion: "1.0.0",
+            policyVersion: "2026-01",
+            timestamp: Date.now(),
+            categories: {
+                necessary: "granted",
+                preferences: "unknown",
+                analytics: "granted",
+                marketing: "denied"
+            },
+            jurisdiction: "global",
+            gpc: false
+        }),
+        true
+    );
+});
+
+test("empty stored envelope fails its contract", () => {
+    assert.equal(
+        isStoragePayload({}),
+        false
+    );
+});
+
+
+/* -------------------------------------------------------------------------- */
+/* Lifecycle                                                                    */
+/* -------------------------------------------------------------------------- */
+
+test("initialize is idempotent", () => {
+    const consent = make();
+
+    let initialized = 0;
+
+    consent.on("initialized", () => initialized++);
+
+    consent.initialize();
+    consent.initialize();
+    consent.initialize();
+
+    assert.equal(initialized, 1);
+});
+
+test("initialize without stored consent starts undecided", () => {
+    const consent = make();
+
+    consent.initialize();
+
+    const state = consent.getState();
+
+    assert.equal(state.hasDecision, false);
+    assert.equal(state.source, "default");
+    assert.equal(state.categories.necessary, "granted");
+    assert.equal(state.categories.analytics, "unknown");
+});
+
+
+console.log(`\n${passed} reliability tests passed.`);
diff --git a/tests/test.html b/tests/test.html
new file mode 100644
index 0000000..b108c3c
--- /dev/null
+++ b/tests/test.html
@@ -0,0 +1,70 @@
+<!doctype html>
+<html lang="en">
+<head>
+<meta charset="utf-8">
+<meta name="viewport" content="width=device-width, initial-scale=1">
+<title>Cookie Consent Core — Hardening Test Lab</title>
+<style>
+body{font-family:system-ui,sans-serif;margin:0;background:#f5f7fa;color:#1f2937}.wrap{max-width:1000px;margin:32px auto;padding:0 16px}.card{background:#fff;border:1px solid #dfe4ea;border-radius:12px;padding:20px;margin-bottom:18px}button{padding:9px 13px;border:1px solid #cbd2da;border-radius:7px;background:#fff;cursor:pointer}button.primary{background:#1f2937;color:#fff}.actions{display:flex;gap:8px;flex-wrap:wrap}.pass{color:#137333}.fail{color:#b42318}.neutral{color:#697386}.test{display:flex;justify-content:space-between;border-bottom:1px solid #eee;padding:10px 0;gap:16px}.test:last-child{border:0}pre{background:#111827;color:#e5e7eb;padding:16px;border-radius:8px;overflow:auto}code{font-family:ui-monospace,monospace}
+</style>
+</head>
+<body>
+<div class="wrap">
+<header><h1>Cookie Consent Core — Hardening Test Lab</h1><p>Regression and robustness tests for Core v1.0.1.</p></header>
+<section class="card"><h2>Controls</h2><div class="actions"><button id="run" class="primary">Run tests</button><button id="accept">Accept All</button><button id="reject">Reject All</button><button id="revoke">Revoke</button><button id="reset">Reset</button><button id="refresh">Refresh</button></div></section>
+<section class="card"><h2>State</h2><pre id="state">—</pre></section>
+<section class="card"><h2>Tests</h2><div id="tests"></div><p id="summary" class="neutral">Not run.</p></section>
+<section class="card"><h2>Cookie</h2><pre id="cookie">—</pre></section>
+<section class="card"><h2>Event log</h2><pre id="log">—</pre></section>
+</div>
+<script type="module">
+import { createConsentEngine, ENGINE_VERSION } from "../core/consent.js";
+import { isStoragePayload } from "../core/storage.js";
+import { isValidCategoriesObject } from "../core/categories.js";
+
+const config={policyVersion:"2026-01",jurisdiction:"global",storage:{name:"cc_consent",duration:180,path:"/",sameSite:"Lax"}};
+const engine=createConsentEngine(config);
+const log=[];
+const events=["initialized","consent:loaded","consent:accepted","consent:rejected","consent:changed","consent:revoked","consent:expired","consent:reset","storage:error"];
+for(const name of events) engine.on(name,payload=>{log.push({time:new Date().toLocaleTimeString(),event:name,payload});render();});
+
+function render(){document.querySelector("#state").textContent=JSON.stringify(engine.getState(),null,2);document.querySelector("#cookie").textContent=document.cookie||"(no cookie)";document.querySelector("#log").textContent=JSON.stringify(log,null,2)}
+function assert(c,m){if(!c)throw new Error(m)}
+function clean(){engine.reset();document.cookie="cc_consent=; Max-Age=0; Path=/; SameSite=Lax"}
+function test(name,fn){try{fn();return [name,true] }catch(e){return [name,false,e.message]}}
+function run(){
+ const results=[];
+ function setCookiePayload(payload){
+   document.cookie="cc_consent="+encodeURIComponent(JSON.stringify(payload))+"; Path=/; SameSite=Lax";
+ }
+ function clearDirect(){ document.cookie="cc_consent=; Max-Age=0; Path=/; SameSite=Lax"; }
+ clean(); engine.initialize();
+ results.push(test("Default / unknown",()=>{const s=engine.getState();assert(s.categories.necessary==="granted","necessary");assert(s.categories.analytics==="unknown","analytics");assert(!s.hasDecision,"decision") }));
+ results.push(test("Accept All",()=>{engine.acceptAll();const s=engine.getState();assert(s.categories.analytics==="granted","analytics");assert(s.hasDecision,"decision")}));
+ results.push(test("Accept All idempotent",()=>{const t=engine.getState().timestamp;let n=0;const off=engine.on("consent:changed",()=>n++);engine.acceptAll();off();assert(n===0,"duplicate changed event");assert(engine.getState().timestamp===t,"timestamp changed")}));
+ results.push(test("Persistence",()=>{const e=createConsentEngine(config);e.initialize();assert(e.getState().source==="storage","source");assert(e.hasConsent("analytics"),"analytics")}));
+ results.push(test("Reject All",()=>{engine.rejectAll();const s=engine.getState();assert(s.categories.analytics==="denied","analytics");assert(s.categories.necessary==="granted","necessary")}));
+ results.push(test("Reject All idempotent",()=>{let n=0;const off=engine.on("consent:changed",()=>n++);engine.rejectAll();off();assert(n===0,"duplicate changed event")}));
+ results.push(test("Selective",()=>{engine.setConsent({preferences:"denied",analytics:"granted",marketing:"denied"});assert(engine.isComplete(),"complete");assert(engine.hasConsent("analytics"),"analytics")}));
+ results.push(test("Invalid value rejected",()=>{let ok=false;try{engine.setConsent({analytics:"banana"})}catch{ok=true}assert(ok,"must throw")}));
+ results.push(test("Necessary cannot be denied",()=>{let ok=false;try{engine.setConsent({necessary:"denied"})}catch{ok=true}assert(ok,"must throw")}));
+ results.push(test("Revoke",()=>{engine.acceptAll();engine.revoke();assert(engine.getState().categories.analytics==="denied","analytics")}));
+ results.push(test("Revoke idempotent",()=>{let n=0;const off=engine.on("consent:revoked",()=>n++);engine.revoke();off();assert(n===0,"duplicate revoke")}));
+ results.push(test("Reset",()=>{engine.acceptAll();engine.reset();assert(!engine.isComplete(),"decision");assert(!document.cookie,"cookie remains")}));
+ results.push(test("Initialize idempotent",()=>{let n=0;const e=createConsentEngine(config);e.on("initialized",()=>n++);e.initialize();e.initialize();assert(n===1,"initialized twice")}));
+ results.push(test("Strict stored envelope validation",()=>{assert(!isStoragePayload({}),"empty payload accepted");assert(isStoragePayload({engineVersion:ENGINE_VERSION,policyVersion:"2026-01",timestamp:Date.now(),categories:{},jurisdiction:"global",gpc:false}),"valid envelope rejected")}));
+ results.push(test("Strict category validation",()=>{assert(isValidCategoriesObject({necessary:"granted",preferences:"unknown",analytics:"granted",marketing:"denied"}),"valid categories rejected");assert(!isValidCategoriesObject({necessary:"denied",preferences:"unknown",analytics:"granted",marketing:"denied"}),"necessary denied accepted");assert(!isValidCategoriesObject({necessary:"granted",preferences:"banana",analytics:"granted",marketing:"denied"}),"invalid category accepted")}));
+ results.push(test("Policy version mismatch",()=>{clean();const e=createConsentEngine(config);e.initialize();e.acceptAll();const fresh=createConsentEngine({...config,policyVersion:"2027-01"});fresh.initialize();assert(!fresh.isComplete(),"old policy accepted");assert(!document.cookie,"old cookie remains")}));
+ results.push(test("Expired cookie",()=>{clean();const e=createConsentEngine(config);e.initialize();e.acceptAll();const raw=decodeURIComponent(document.cookie.split("=").slice(1).join("="));const payload=JSON.parse(raw);payload.timestamp=Date.now()-181*24*60*60*1000;setCookiePayload(payload);const fresh=createConsentEngine(config);let expired=0;fresh.on("consent:expired",()=>expired++);fresh.initialize();assert(expired===1,"expired event");assert(!fresh.isComplete(),"expired consent accepted");assert(!document.cookie,"expired cookie remains")}));
+ results.push(test("Invalid persisted category payload",()=>{clean();const bad={engineVersion:ENGINE_VERSION,policyVersion:"2026-01",timestamp:Date.now(),categories:{necessary:"granted",preferences:"banana",analytics:"granted",marketing:"denied"},jurisdiction:"global",gpc:false};setCookiePayload(bad);const e=createConsentEngine(config);e.initialize();assert(!e.isComplete(),"invalid payload accepted");assert(!document.cookie,"invalid cookie remains")}));
+ results.push(test("Future timestamp",()=>{clean();const e=createConsentEngine(config);e.initialize();e.acceptAll();const raw=decodeURIComponent(document.cookie.split("=").slice(1).join("="));const payload=JSON.parse(raw);payload.timestamp=Date.now()+60*60*1000;setCookiePayload(payload);const fresh=createConsentEngine(config);fresh.initialize();assert(!fresh.isComplete(),"future timestamp accepted");assert(!document.cookie,"future cookie remains")}));
+ const failed=results.filter(x=>!x[1]);
+ document.querySelector("#tests").innerHTML=results.map(x=>`<div class="test"><span>${x[0]}${x[2]?` — ${x[2]}`:""}</span><strong class="${x[1]?"pass":"fail"}">${x[1]?"PASS":"FAIL"}</strong></div>`).join("");
+ document.querySelector("#summary").textContent=`${results.length-failed.length}/${results.length} tests passed`;
+ document.querySelector("#summary").className=failed.length?"fail":"pass";
+ render();
+}
+document.querySelector("#run").onclick=run;document.querySelector("#accept").onclick=()=>{engine.acceptAll();render()};document.querySelector("#reject").onclick=()=>{engine.rejectAll();render()};document.querySelector("#revoke").onclick=()=>{engine.revoke();render()};document.querySelector("#reset").onclick=()=>{engine.reset();render()};document.querySelector("#refresh").onclick=render;engine.initialize();render();
+</script>
+</body>
+</html>