diff --git a/apps/api/src/app.ts b/apps/api/src/app.ts
index 21b68f0..bdd7969 100644
--- a/apps/api/src/app.ts
+++ b/apps/api/src/app.ts
@@ -223,7 +223,9 @@ export async function createApp(options: CreateAppOptions = {}) {
         : undefined;
       if (!resource) return reply.code(404).send();
       reply.type(resource.mimeType);
+      reply.header("Cache-Control", "public, max-age=31536000, immutable");
       reply.header("Content-Disposition", "inline");
+      reply.header("ETag", `"sha256-${resource.sha256}"`);
       return resource.bytes;
     },
   );
diff --git a/apps/api/src/local-data-root.ts b/apps/api/src/local-data-root.ts
index 0886f72..68c3959 100644
--- a/apps/api/src/local-data-root.ts
+++ b/apps/api/src/local-data-root.ts
@@ -89,6 +89,7 @@ export interface PublicAssetPayload {
   bytes: Buffer;
   mimeType: string;
   resourceVersion: string;
+  sha256: string;
 }
 
 export interface PublicAssetResolver {
@@ -333,6 +334,7 @@ export function createPublicAssetResolver(input: {
         bytes,
         mimeType: entry.mimeType,
         resourceVersion: entry.resourceVersion,
+        sha256,
       };
     },
   };
diff --git a/apps/web/public/public-cache-service-worker.js b/apps/web/public/public-cache-service-worker.js
new file mode 100644
index 0000000..64a349b
--- /dev/null
+++ b/apps/web/public/public-cache-service-worker.js
@@ -0,0 +1,72 @@
+const CACHE_NAME = "dada-public-assets-v1";
+const DATABASE_NAME = "dada-public-asset-cache-v1";
+const LRU_STORE = "public_asset_lru";
+const POLICY_STORE = "client_cache_policy";
+const PUBLIC_ROUTE = /^\/api\/v1\/assets\/public\/([a-z0-9][a-z0-9._-]{0,79})\/([0-9a-f-]{36})$/i;
+
+function openDatabase() {
+  return new Promise((resolve, reject) => {
+    const request = indexedDB.open(DATABASE_NAME, 1);
+    request.onupgradeneeded = () => {
+      const database = request.result;
+      if (!database.objectStoreNames.contains(LRU_STORE)) database.createObjectStore(LRU_STORE, { keyPath: "resource_id" });
+      if (!database.objectStoreNames.contains(POLICY_STORE)) database.createObjectStore(POLICY_STORE, { keyPath: "policy_id" });
+    };
+    request.onsuccess = () => resolve(request.result);
+    request.onerror = () => reject(request.error ?? new Error("public_cache_database_open_failed"));
+  });
+}
+
+async function readMetadata(resourceId) {
+  const database = await openDatabase();
+  try {
+    return await new Promise((resolve, reject) => {
+      const request = database.transaction(LRU_STORE, "readonly").objectStore(LRU_STORE).get(resourceId);
+      request.onsuccess = () => resolve(request.result);
+      request.onerror = () => reject(request.error ?? new Error("public_cache_metadata_read_failed"));
+    });
+  } finally {
+    database.close();
+  }
+}
+
+async function touchMetadata(resourceId, releaseVersion) {
+  const database = await openDatabase();
+  try {
+    await new Promise((resolve, reject) => {
+      const transaction = database.transaction(LRU_STORE, "readwrite");
+      const store = transaction.objectStore(LRU_STORE);
+      const request = store.get(resourceId);
+      request.onsuccess = () => {
+        const entry = request.result;
+        if (entry?.release_version === releaseVersion) store.put({ ...entry, last_accessed_at: Date.now() });
+      };
+      transaction.oncomplete = () => resolve();
+      transaction.onabort = () => reject(transaction.error ?? new Error("public_cache_touch_aborted"));
+      transaction.onerror = () => reject(transaction.error ?? new Error("public_cache_touch_failed"));
+    });
+  } finally {
+    database.close();
+  }
+}
+
+self.addEventListener("install", () => self.skipWaiting());
+self.addEventListener("activate", (event) => event.waitUntil(self.clients.claim()));
+self.addEventListener("fetch", (event) => {
+  if (event.request.method !== "GET") return;
+  const url = new URL(event.request.url);
+  if (url.origin !== self.location.origin || url.search || url.hash) return;
+  const route = PUBLIC_ROUTE.exec(url.pathname);
+  if (!route) return;
+
+  event.respondWith((async () => {
+    const releaseVersion = route[1];
+    const resourceId = route[2];
+    const metadata = await readMetadata(resourceId);
+    if (!metadata || metadata.release_version !== releaseVersion) return fetch(event.request);
+    const cached = await (await caches.open(CACHE_NAME)).match(event.request);
+    if (!cached) return fetch(event.request);
+    event.waitUntil(touchMetadata(resourceId, releaseVersion));
+    return cached;
+  })());
+});
diff --git a/apps/web/src/main.tsx b/apps/web/src/main.tsx
index c43edd8..cf3cf82 100644
--- a/apps/web/src/main.tsx
+++ b/apps/web/src/main.tsx
@@ -2,6 +2,7 @@ import { StrictMode } from "react";
 import { createRoot } from "react-dom/client";
 
 import { ToolchainProbe } from "./toolchain-probe.js";
+import { registerPublicAssetServiceWorker } from "./public-asset-cache.js";
 
 const root = document.getElementById("root");
 
@@ -9,6 +10,9 @@ if (!root) {
   throw new Error("Dada web root element is missing.");
 }
 
+// Cache failure leaves public assets network-backed and must not create alternate persistence.
+void registerPublicAssetServiceWorker().catch(() => undefined);
+
 createRoot(root).render(
   <StrictMode>
     <ToolchainProbe />
diff --git a/apps/web/src/public-asset-cache.ts b/apps/web/src/public-asset-cache.ts
new file mode 100644
index 0000000..8936098
--- /dev/null
+++ b/apps/web/src/public-asset-cache.ts
@@ -0,0 +1,334 @@
+export const MAX_PUBLIC_CACHE_BYTES = 157_286_400;
+export const PUBLIC_ASSET_CACHE_NAME = "dada-public-assets-v1";
+export const PUBLIC_CACHE_DATABASE_NAME = "dada-public-asset-cache-v1";
+export const PUBLIC_ASSET_LRU_STORE = "public_asset_lru";
+export const PUBLIC_CACHE_POLICY_STORE = "client_cache_policy";
+
+const policyId = "public";
+const resourceIdPattern = /^[0-9a-f]{8}-[0-9a-f]{4}-[1-8][0-9a-f]{3}-[89ab][0-9a-f]{3}-[0-9a-f]{12}$/i;
+const releaseVersionPattern = /^[a-z0-9][a-z0-9._-]{0,79}$/i;
+const publicAssetPathPattern = /^\/api\/v1\/assets\/public\/([a-z0-9][a-z0-9._-]{0,79})\/([0-9a-f-]{36})$/i;
+const allowlistedKinds = new Set(["thumbnail", "template_conversion", "font"]);
+
+export interface PublicCacheDescriptor {
+  access_class: "public_release_asset";
+  cache_kind: "thumbnail" | "template_conversion" | "font";
+  release_version: string;
+  resource_id: string;
+}
+
+export interface PublicAssetLruEntry {
+  bytes: number;
+  last_accessed_at: number;
+  release_version: string;
+  resource_id: string;
+}
+
+export interface ClientCachePolicy {
+  cached_release_version: string | null;
+  current_public_cache_bytes: number;
+  eviction_policy: "LRU";
+  last_eviction_at: number | null;
+  max_public_cache_bytes: number;
+}
+
+interface StoredClientCachePolicy extends ClientCachePolicy {
+  policy_id: typeof policyId;
+}
+
+export interface PublicCacheWritePlan {
+  accepted: boolean;
+  evict: string[];
+  resulting_bytes: number;
+}
+
+type Fetcher = (input: RequestInfo | URL, init?: RequestInit) => Promise<Response>;
+
+export function isPublicCacheDescriptor(value: unknown): value is PublicCacheDescriptor {
+  if (!value || typeof value !== "object") return false;
+  const candidate = value as Record<string, unknown>;
+  return candidate.access_class === "public_release_asset"
+    && typeof candidate.cache_kind === "string"
+    && allowlistedKinds.has(candidate.cache_kind)
+    && typeof candidate.release_version === "string"
+    && releaseVersionPattern.test(candidate.release_version)
+    && typeof candidate.resource_id === "string"
+    && resourceIdPattern.test(candidate.resource_id);
+}
+
+export function buildPublicAssetUrl(releaseVersion: string, resourceId: string) {
+  if (!releaseVersionPattern.test(releaseVersion)) throw new Error("release_version_invalid");
+  if (!resourceIdPattern.test(resourceId)) throw new Error("resource_id_invalid");
+  return `/api/v1/assets/public/${releaseVersion}/${resourceId}`;
+}
+
+export function isPublicServiceWorkerRoute(url: URL, applicationOrigin: string) {
+  if (url.origin !== applicationOrigin || url.search !== "" || url.hash !== "") return false;
+  const match = publicAssetPathPattern.exec(url.pathname);
+  return Boolean(match && releaseVersionPattern.test(match[1] ?? "") && resourceIdPattern.test(match[2] ?? ""));
+}
+
+export function planPublicCacheWrite(
+  entries: PublicAssetLruEntry[],
+  incoming: PublicAssetLruEntry,
+  maxBytes = MAX_PUBLIC_CACHE_BYTES,
+): PublicCacheWritePlan {
+  if (!Number.isSafeInteger(maxBytes) || maxBytes <= 0) throw new Error("max_public_cache_bytes_invalid");
+  const existingBytes = entries.reduce((sum, entry) => sum + entry.bytes, 0);
+  if (!Number.isSafeInteger(incoming.bytes) || incoming.bytes <= 0 || incoming.bytes > maxBytes) {
+    return { accepted: false, evict: [], resulting_bytes: existingBytes };
+  }
+
+  const replaced = entries.filter((entry) => entry.resource_id === incoming.resource_id);
+  const retained = entries.filter((entry) => entry.resource_id !== incoming.resource_id);
+  let resultingBytes = retained.reduce((sum, entry) => sum + entry.bytes, 0) + incoming.bytes;
+  const candidates = [...retained].sort((left, right) => {
+    const leftOld = left.release_version === incoming.release_version ? 1 : 0;
+    const rightOld = right.release_version === incoming.release_version ? 1 : 0;
+    if (leftOld !== rightOld) return leftOld - rightOld;
+    if (left.last_accessed_at !== right.last_accessed_at) return left.last_accessed_at - right.last_accessed_at;
+    return left.resource_id.localeCompare(right.resource_id);
+  });
+  const evict = replaced.map((entry) => entry.resource_id);
+  for (const candidate of candidates) {
+    if (resultingBytes <= maxBytes) break;
+    evict.push(candidate.resource_id);
+    resultingBytes -= candidate.bytes;
+  }
+  return { accepted: resultingBytes <= maxBytes, evict, resulting_bytes: resultingBytes };
+}
+
+function requestResult<T>(request: IDBRequest<T>) {
+  return new Promise<T>((resolve, reject) => {
+    request.onsuccess = () => resolve(request.result);
+    request.onerror = () => reject(request.error ?? new Error("indexed_db_request_failed"));
+  });
+}
+
+function transactionComplete(transaction: IDBTransaction) {
+  return new Promise<void>((resolve, reject) => {
+    transaction.oncomplete = () => resolve();
+    transaction.onabort = () => reject(transaction.error ?? new Error("indexed_db_transaction_aborted"));
+    transaction.onerror = () => reject(transaction.error ?? new Error("indexed_db_transaction_failed"));
+  });
+}
+
+function openPublicCacheDatabase() {
+  return new Promise<IDBDatabase>((resolve, reject) => {
+    const request = indexedDB.open(PUBLIC_CACHE_DATABASE_NAME, 1);
+    request.onupgradeneeded = () => {
+      const database = request.result;
+      if (!database.objectStoreNames.contains(PUBLIC_ASSET_LRU_STORE)) {
+        database.createObjectStore(PUBLIC_ASSET_LRU_STORE, { keyPath: "resource_id" });
+      }
+      if (!database.objectStoreNames.contains(PUBLIC_CACHE_POLICY_STORE)) {
+        database.createObjectStore(PUBLIC_CACHE_POLICY_STORE, { keyPath: "policy_id" });
+      }
+    };
+    request.onsuccess = () => resolve(request.result);
+    request.onerror = () => reject(request.error ?? new Error("public_cache_database_open_failed"));
+  });
+}
+
+async function readEntries(database: IDBDatabase) {
+  const transaction = database.transaction(PUBLIC_ASSET_LRU_STORE, "readonly");
+  return requestResult(transaction.objectStore(PUBLIC_ASSET_LRU_STORE).getAll()) as Promise<PublicAssetLruEntry[]>;
+}
+
+async function readStoredPolicy(database: IDBDatabase) {
+  const transaction = database.transaction(PUBLIC_CACHE_POLICY_STORE, "readonly");
+  return requestResult(transaction.objectStore(PUBLIC_CACHE_POLICY_STORE).get(policyId)) as Promise<StoredClientCachePolicy | undefined>;
+}
+
+function withoutPolicyId(policy: StoredClientCachePolicy): ClientCachePolicy {
+  const { policy_id: _policyId, ...publicPolicy } = policy;
+  return publicPolicy;
+}
+
+function parsePublicAssetUrl(url: string) {
+  const parsed = new URL(url, location.origin);
+  if (!isPublicServiceWorkerRoute(parsed, location.origin)) return undefined;
+  const match = publicAssetPathPattern.exec(parsed.pathname);
+  if (!match) return undefined;
+  return { release_version: match[1]!, resource_id: match[2]! };
+}
+
+interface LockManagerSubset {
+  request<T>(name: string, callback: () => Promise<T>): Promise<T>;
+}
+
+export class PublicAssetCache {
+  private readonly fetcher: Fetcher;
+  private readonly maxBytes: number;
+  private readonly now: () => number;
+
+  constructor(input: { fetcher?: Fetcher; maxBytes?: number; now?: () => number } = {}) {
+    this.fetcher = input.fetcher ?? ((request, init) => fetch(request, init));
+    this.maxBytes = input.maxBytes ?? MAX_PUBLIC_CACHE_BYTES;
+    this.now = input.now ?? Date.now;
+    if (!Number.isSafeInteger(this.maxBytes) || this.maxBytes <= 0 || this.maxBytes > MAX_PUBLIC_CACHE_BYTES) {
+      throw new Error("max_public_cache_bytes_invalid");
+    }
+  }
+
+  private async withWriteLock<T>(callback: () => Promise<T>) {
+    const locks = (navigator as Navigator & { locks?: LockManagerSubset }).locks;
+    if (!locks) throw new Error("web_locks_unavailable");
+    return locks.request("dada-public-asset-cache-write", callback);
+  }
+
+  private defaultPolicy(entries: PublicAssetLruEntry[] = []): StoredClientCachePolicy {
+    return {
+      cached_release_version: null,
+      current_public_cache_bytes: entries.reduce((sum, entry) => sum + entry.bytes, 0),
+      eviction_policy: "LRU",
+      last_eviction_at: null,
+      max_public_cache_bytes: this.maxBytes,
+      policy_id: policyId,
+    };
+  }
+
+  private async reconcileUnlocked() {
+    const database = await openPublicCacheDatabase();
+    try {
+      const cache = await caches.open(PUBLIC_ASSET_CACHE_NAME);
+      const [entries, keys, existingPolicy] = await Promise.all([
+        readEntries(database),
+        cache.keys(),
+        readStoredPolicy(database),
+      ]);
+      const entriesById = new Map(entries.map((entry) => [entry.resource_id, entry]));
+      const validCacheIds = new Set<string>();
+      for (const key of keys) {
+        const parsed = parsePublicAssetUrl(key.url);
+        const metadata = parsed ? entriesById.get(parsed.resource_id) : undefined;
+        if (!parsed || !metadata || metadata.release_version !== parsed.release_version) await cache.delete(key);
+        else validCacheIds.add(parsed.resource_id);
+      }
+      const retained = entries.filter((entry) => validCacheIds.has(entry.resource_id));
+      const transaction = database.transaction([PUBLIC_ASSET_LRU_STORE, PUBLIC_CACHE_POLICY_STORE], "readwrite");
+      const lruStore = transaction.objectStore(PUBLIC_ASSET_LRU_STORE);
+      for (const entry of entries) if (!validCacheIds.has(entry.resource_id)) lruStore.delete(entry.resource_id);
+      const previousPolicy = existingPolicy ?? this.defaultPolicy();
+      transaction.objectStore(PUBLIC_CACHE_POLICY_STORE).put({
+        ...previousPolicy,
+        current_public_cache_bytes: retained.reduce((sum, entry) => sum + entry.bytes, 0),
+        max_public_cache_bytes: this.maxBytes,
+      } satisfies StoredClientCachePolicy);
+      await transactionComplete(transaction);
+    } finally {
+      database.close();
+    }
+  }
+
+  async cache(candidate: unknown) {
+    if (!isPublicCacheDescriptor(candidate)) return { status: "rejected_not_allowlisted" as const };
+    const url = buildPublicAssetUrl(candidate.release_version, candidate.resource_id);
+    const response = await this.fetcher(url, { credentials: "same-origin", method: "GET" });
+    if (!response.ok) return { status: "fetch_failed" as const };
+    const blob = await response.blob();
+    if (blob.size <= 0 || blob.size > this.maxBytes) return { status: "rejected_capacity" as const };
+
+    return this.withWriteLock(async () => {
+      await this.reconcileUnlocked();
+      const database = await openPublicCacheDatabase();
+      try {
+        const entries = await readEntries(database);
+        const accessedAt = this.now();
+        const incoming: PublicAssetLruEntry = {
+          bytes: blob.size,
+          last_accessed_at: accessedAt,
+          release_version: candidate.release_version,
+          resource_id: candidate.resource_id,
+        };
+        const plan = planPublicCacheWrite(entries, incoming, this.maxBytes);
+        if (!plan.accepted) return { status: "rejected_capacity" as const };
+        const entriesById = new Map(entries.map((entry) => [entry.resource_id, entry]));
+        const cache = await caches.open(PUBLIC_ASSET_CACHE_NAME);
+
+        // Physical cache entries are removed before the incoming body is persisted.
+        for (const resourceId of plan.evict) {
+          const entry = entriesById.get(resourceId);
+          if (entry) await cache.delete(buildPublicAssetUrl(entry.release_version, entry.resource_id));
+        }
+        await cache.put(url, new Response(blob, {
+          headers: response.headers,
+          status: response.status,
+          statusText: response.statusText,
+        }));
+
+        const previousPolicy = await readStoredPolicy(database) ?? this.defaultPolicy(entries);
+        const transaction = database.transaction([PUBLIC_ASSET_LRU_STORE, PUBLIC_CACHE_POLICY_STORE], "readwrite");
+        const lruStore = transaction.objectStore(PUBLIC_ASSET_LRU_STORE);
+        for (const resourceId of plan.evict) lruStore.delete(resourceId);
+        lruStore.put(incoming);
+        transaction.objectStore(PUBLIC_CACHE_POLICY_STORE).put({
+          cached_release_version: candidate.release_version,
+          current_public_cache_bytes: plan.resulting_bytes,
+          eviction_policy: "LRU",
+          last_eviction_at: plan.evict.length > 0 ? accessedAt : previousPolicy.last_eviction_at,
+          max_public_cache_bytes: this.maxBytes,
+          policy_id: policyId,
+        } satisfies StoredClientCachePolicy);
+        await transactionComplete(transaction);
+        return {
+          bytes: blob.size,
+          evicted_resource_ids: plan.evict,
+          status: "cached" as const,
+        };
+      } finally {
+        database.close();
+      }
+    });
+  }
+
+  async inspect() {
+    return this.withWriteLock(async () => {
+      await this.reconcileUnlocked();
+      const database = await openPublicCacheDatabase();
+      try {
+        const [entries, storedPolicy, keys, cacheNames, databases] = await Promise.all([
+          readEntries(database),
+          readStoredPolicy(database),
+          caches.open(PUBLIC_ASSET_CACHE_NAME).then((cache) => cache.keys()),
+          caches.keys(),
+          typeof indexedDB.databases === "function" ? indexedDB.databases() : Promise.resolve([]),
+        ]);
+        return {
+          cache_keys: keys.map((request) => request.url).sort(),
+          cache_names: cacheNames.filter((name) => name.startsWith("dada-")).sort(),
+          entries: entries.sort((left, right) => left.resource_id.localeCompare(right.resource_id)),
+          indexed_db_names: databases.map((databaseInfo) => databaseInfo.name).filter((name): name is string => Boolean(name?.startsWith("dada-"))).sort(),
+          policy: withoutPolicyId(storedPolicy ?? this.defaultPolicy(entries)),
+        };
+      } finally {
+        database.close();
+      }
+    });
+  }
+
+  async clear() {
+    return this.withWriteLock(async () => {
+      await caches.delete(PUBLIC_ASSET_CACHE_NAME);
+      await new Promise<void>((resolve, reject) => {
+        const request = indexedDB.deleteDatabase(PUBLIC_CACHE_DATABASE_NAME);
+        request.onsuccess = () => resolve();
+        request.onerror = () => reject(request.error ?? new Error("public_cache_database_delete_failed"));
+        request.onblocked = () => reject(new Error("public_cache_database_delete_blocked"));
+      });
+    });
+  }
+}
+
+export function createPublicAssetCache() {
+  return new PublicAssetCache({ maxBytes: MAX_PUBLIC_CACHE_BYTES });
+}
+
+export function createPublicAssetCacheForTest(input: { maxBytes: number; now?: () => number }) {
+  return new PublicAssetCache(input);
+}
+
+export async function registerPublicAssetServiceWorker() {
+  if (!("serviceWorker" in navigator)) throw new Error("service_worker_unavailable");
+  return navigator.serviceWorker.register("/public-cache-service-worker.js", { scope: "/", type: "module" });
+}
diff --git a/package.json b/package.json
index 2d0c936..ba28692 100644
--- a/package.json
+++ b/package.json
@@ -14,7 +14,7 @@
     "test:integration": "vitest run tests/integration",
     "test:api": "pnpm check:openapi && vitest run tests/api",
     "test:worker": "pnpm --filter @dada/worker build && node scripts/worker-smoke.mjs && vitest run tests/worker",
-    "test:e2e": "pnpm check:openapi && playwright test tests/e2e/event-sync.spec.ts tests/e2e/support-gate.spec.ts tests/e2e/local-data-boundary.spec.ts tests/e2e/storage-capacity.spec.ts --config playwright.config.ts",
+    "test:e2e": "pnpm check:openapi && playwright test tests/e2e/event-sync.spec.ts tests/e2e/support-gate.spec.ts tests/e2e/local-data-boundary.spec.ts tests/e2e/storage-capacity.spec.ts tests/e2e/public-asset-cache.spec.ts --config playwright.config.ts",
     "test:visual": "node scripts/validate-layer-scope.mjs VISUAL",
     "test:performance": "node scripts/validate-layer-scope.mjs PERFORMANCE",
     "test:security": "node scripts/verify-frozen-dependencies.mjs && node scripts/redaction-scan.mjs",
@@ -30,7 +30,9 @@
     "test:wp0-04": "node scripts/run-wp0-04-validation.mjs",
     "test:wp0-04:red": "node scripts/run-wp0-04-validation.mjs --phase red",
     "test:wp0-05": "node scripts/run-wp0-05-validation.mjs",
-    "test:wp0-05:red": "node scripts/run-wp0-05-validation.mjs --phase red"
+    "test:wp0-05:red": "node scripts/run-wp0-05-validation.mjs --phase red",
+    "test:wp0-06": "node scripts/run-wp0-06-validation.mjs",
+    "test:wp0-06:red": "node scripts/run-wp0-06-validation.mjs --phase red"
   },
   "devDependencies": {
     "@playwright/test": "1.62.0",
diff --git a/scripts/run-wp0-06-validation.mjs b/scripts/run-wp0-06-validation.mjs
new file mode 100644
index 0000000..a575183
--- /dev/null
+++ b/scripts/run-wp0-06-validation.mjs
@@ -0,0 +1,87 @@
+import { createHash } from "node:crypto";
+import { spawnSync } from "node:child_process";
+import { copyFileSync, existsSync, mkdirSync, readFileSync, readdirSync, statSync, writeFileSync } from "node:fs";
+import { resolve } from "node:path";
+
+const phaseIndex = process.argv.indexOf("--phase");
+const phase = phaseIndex >= 0 ? process.argv[phaseIndex + 1] : "green";
+if (!["red", "green"].includes(phase)) throw new Error(`Unsupported phase: ${phase}`);
+const runId = process.env.DADA_TDD_RUN_ID ?? `wp0-06-${phase}-${new Date().toISOString().replace(/[^0-9]/g, "")}`;
+const runDirectory = resolve("artifacts", "tdd", runId);
+const caseId = "TDD-WP0-CACHE-001-public-lru";
+const caseDirectory = resolve(runDirectory, "cases", caseId);
+const playwrightDirectory = resolve(runDirectory, "playwright");
+if (existsSync(runDirectory)) throw new Error(`Evidence run already exists: ${runId}`);
+mkdirSync(caseDirectory, { recursive: true });
+
+const redCommands = [
+  ["pnpm exec vitest run tests/unit/wp0-06-public-cache.test.ts", ["exec", "vitest", "run", "tests/unit/wp0-06-public-cache.test.ts"]],
+  ["pnpm exec playwright test tests/e2e/public-asset-cache.spec.ts --config playwright.config.ts", ["exec", "playwright", "test", "tests/e2e/public-asset-cache.spec.ts", "--config", "playwright.config.ts"]],
+];
+const greenCommands = [
+  ["pnpm test:unit", ["test:unit"]],
+  ["pnpm test:e2e", ["test:e2e"]],
+  ["pnpm validate:tdd-trace", ["validate:tdd-trace"]],
+];
+const environment = {
+  ...process.env,
+  DADA_EVIDENCE_DIR_CACHE: caseDirectory,
+  DADA_PLAYWRIGHT_OUTPUT_DIR: playwrightDirectory,
+};
+const startedAt = new Date().toISOString();
+const commands = [];
+for (const [command, args] of phase === "red" ? redCommands : greenCommands) {
+  const started_at = new Date().toISOString();
+  const executable = process.platform === "win32" ? (process.env.ComSpec ?? "cmd.exe") : "pnpm";
+  const actualArgs = process.platform === "win32" ? ["/d", "/s", "/c", `pnpm ${args.join(" ")}`] : args;
+  const execution = spawnSync(executable, actualArgs, { encoding: "utf8", env: environment });
+  if (execution.stdout) process.stdout.write(execution.stdout);
+  if (execution.stderr) process.stderr.write(execution.stderr);
+  commands.push({ command, exit_code: execution.status ?? 1, finished_at: new Date().toISOString(), started_at });
+}
+
+function find(root, target) {
+  if (!existsSync(root)) return [];
+  return readdirSync(root).flatMap((entry) => {
+    const child = resolve(root, entry);
+    return statSync(child).isDirectory() ? find(child, target) : entry === target ? [child] : [];
+  });
+}
+if (phase === "green") {
+  const trace = find(playwrightDirectory, "trace.zip").find((path) => path.replaceAll("\\", "/").includes("public-asset-cache"));
+  if (trace) copyFileSync(trace, resolve(caseDirectory, "trace.zip"));
+}
+
+writeFileSync(resolve(caseDirectory, "commands.json"), `${JSON.stringify({ commands, phase, run_id: runId, schema_version: "1.0" }, null, 2)}\n`);
+const expectedEvidence = ["cache-enumeration.json", "lru-trace.json", "trace.zip"];
+const missingEvidence = phase === "green" ? expectedEvidence.filter((path) => !existsSync(resolve(caseDirectory, path))) : [];
+const commandState = phase === "red" ? commands.every((item) => item.exit_code !== 0) : commands.every((item) => item.exit_code === 0);
+const status = phase === "red" ? (commandState ? "red_confirmed" : "failed") : (commandState && missingEvidence.length === 0 ? "passed" : "failed");
+const result = {
+  acceptance_criteria: ["AC-46", "AC-48"],
+  automation: ["automated"],
+  commit: spawnSync("git", ["rev-parse", "--short", "HEAD"], { encoding: "utf8" }).stdout.trim(),
+  environment: { arch: process.arch, node: process.version.slice(1), os: process.platform },
+  evidence_refs: expectedEvidence,
+  finished_at: new Date().toISOString(),
+  layer: ["UNIT", "E2E"],
+  manifest: { path: "tasks.manifest.json", sha256: createHash("sha256").update(readFileSync("tasks.manifest.json")).digest("hex").toUpperCase() },
+  missing_evidence: missingEvidence,
+  parent_family: "TDD-WP0-CACHE-001",
+  phase,
+  release_gate: ["work_package:WP-0", "release:P0-A"],
+  requirements: ["NFR-07", "17.14"],
+  run_id: runId,
+  schema_version: "1.0",
+  started_at: startedAt,
+  status,
+  task_id: "TASK-WP0-06",
+  test_id: caseId,
+  work_package: "WP-0",
+  worktree_under_test: spawnSync("git", ["status", "--porcelain"], { encoding: "utf8" }).stdout.trim() ? "uncommitted implementation" : "clean committed implementation",
+};
+writeFileSync(resolve(caseDirectory, "result.json"), `${JSON.stringify(result, null, 2)}\n`);
+const summary = { cases: [{ missing_evidence: missingEvidence, status, test_id: caseId }], phase, run_id: runId, status };
+writeFileSync(resolve(runDirectory, "evidence.json"), `${JSON.stringify(summary, null, 2)}\n`);
+console.log(JSON.stringify(summary, null, 2));
+if (status !== (phase === "red" ? "red_confirmed" : "passed")) process.exit(1);
diff --git a/tests/e2e/fixtures/public-asset-cache.html b/tests/e2e/fixtures/public-asset-cache.html
new file mode 100644
index 0000000..e3b7cda
--- /dev/null
+++ b/tests/e2e/fixtures/public-asset-cache.html
@@ -0,0 +1,5 @@
+<!doctype html>
+<html lang="zh-CN">
+  <head><meta charset="UTF-8" /><meta name="viewport" content="width=device-width, initial-scale=1" /><title>Dada public cache probe</title></head>
+  <body><main><h1>Public cache probe</h1><output id="status">starting</output></main><script type="module" src="/tests/e2e/fixtures/public-asset-cache.ts"></script></body>
+</html>
diff --git a/tests/e2e/fixtures/public-asset-cache.ts b/tests/e2e/fixtures/public-asset-cache.ts
new file mode 100644
index 0000000..ad8906e
--- /dev/null
+++ b/tests/e2e/fixtures/public-asset-cache.ts
@@ -0,0 +1,25 @@
+import {
+  createPublicAssetCacheForTest,
+  registerPublicAssetServiceWorker,
+} from "../../../apps/web/src/public-asset-cache.js";
+
+declare global {
+  interface Window {
+    dadaCacheProbe: {
+      cache: ReturnType<typeof createPublicAssetCacheForTest>;
+      register(): Promise<void>;
+    };
+  }
+}
+
+let tick = 1_000;
+const cache = createPublicAssetCacheForTest({ maxBytes: 20, now: () => ++tick });
+window.dadaCacheProbe = {
+  cache,
+  async register() {
+    await registerPublicAssetServiceWorker();
+    await navigator.serviceWorker.ready;
+    document.querySelector("#status")!.textContent = "ready";
+  },
+};
+void window.dadaCacheProbe.register();
diff --git a/tests/e2e/public-asset-cache.spec.ts b/tests/e2e/public-asset-cache.spec.ts
new file mode 100644
index 0000000..eda21f9
--- /dev/null
+++ b/tests/e2e/public-asset-cache.spec.ts
@@ -0,0 +1,121 @@
+import { mkdirSync, writeFileSync } from "node:fs";
+import { resolve } from "node:path";
+
+import { expect, test } from "@playwright/test";
+import { createServer, type ViteDevServer } from "vite";
+
+const resources = new Map([
+  ["123e4567-e89b-42d3-a456-426614174001", "aaaaaaaa"],
+  ["123e4567-e89b-42d3-a456-426614174002", "bbbbbbbb"],
+  ["123e4567-e89b-42d3-a456-426614174003", "cccccccc"],
+]);
+let vite: ViteDevServer;
+let webUrl: string;
+let publicFetchCount = 0;
+
+test.beforeAll(async () => {
+  vite = await createServer({
+    configFile: false,
+    plugins: [{
+      name: "wp0-06-public-assets",
+      configureServer(server) {
+        server.middlewares.use((request, response, next) => {
+          const match = request.url?.match(/^\/api\/v1\/assets\/public\/[^/]+\/([0-9a-f-]+)$/i);
+          if (!match) return next();
+          const body = resources.get(match[1] ?? "");
+          if (!body) { response.statusCode = 404; response.end(); return; }
+          publicFetchCount += 1;
+          response.setHeader("Cache-Control", "public, max-age=31536000, immutable");
+          response.setHeader("Content-Type", "application/octet-stream");
+          response.end(body);
+        });
+      },
+    }],
+    publicDir: resolve("apps/web/public"),
+    root: process.cwd(),
+    server: { host: "127.0.0.1", port: 0 },
+  });
+  await vite.listen();
+  const address = vite.httpServer?.address();
+  if (!address || typeof address === "string") throw new Error("Vite did not expose a test port.");
+  webUrl = `http://127.0.0.1:${address.port}`;
+});
+
+test.afterAll(async () => vite.close());
+
+test("TDD-WP0-CACHE-001-public-lru enumerates isolated browser persistence", async ({ page }) => {
+  publicFetchCount = 0;
+  await page.goto(`${webUrl}/tests/e2e/fixtures/public-asset-cache.html`);
+  await expect(page.locator("#status")).toHaveText("ready");
+  await page.reload();
+  await expect(page.locator("#status")).toHaveText("ready");
+
+  const result = await page.evaluate(async () => {
+    const ids = [
+      "123e4567-e89b-42d3-a456-426614174001",
+      "123e4567-e89b-42d3-a456-426614174002",
+      "123e4567-e89b-42d3-a456-426614174003",
+    ];
+    const descriptor = (resource_id: string, release_version: string) => ({
+      access_class: "public_release_asset" as const,
+      cache_kind: "thumbnail" as const,
+      release_version,
+      resource_id,
+    });
+    const cache = window.dadaCacheProbe.cache;
+    await cache.clear();
+    const first = await cache.cache(descriptor(ids[0]!, "asset-20260727.1"));
+    const second = await cache.cache(descriptor(ids[1]!, "asset-20260727.1"));
+    await fetch(`/api/v1/assets/public/asset-20260727.1/${ids[0]}`);
+    const third = await cache.cache(descriptor(ids[2]!, "asset-20260727.2"));
+    const rejected = [];
+    for (const [access_class, cache_kind] of [
+      ["internal_preview_asset", "thumbnail"], ["private_user_asset", "thumbnail"],
+      ["public_release_asset", "project"], ["public_release_asset", "prompt"],
+      ["public_release_asset", "verification_code"], ["public_release_asset", "session"],
+      ["public_release_asset", "unsaved_edit"], ["public_release_asset", "user_download"],
+    ]) {
+      rejected.push(await cache.cache({ access_class, cache_kind, release_version: "asset-20260727.2", resource_id: ids[0] }));
+    }
+    const enumeration = await cache.inspect();
+    const registrations = await navigator.serviceWorker.getRegistrations();
+    return {
+      enumeration,
+      local_storage_keys: Object.keys(localStorage),
+      rejected,
+      results: [first, second, third],
+      service_workers: registrations.map((item) => ({ active: item.active?.state, scope: item.scope, script_url: item.active?.scriptURL })),
+      session_storage_keys: Object.keys(sessionStorage),
+    };
+  });
+
+  expect(result.results[2]).toMatchObject({ evicted_resource_ids: ["123e4567-e89b-42d3-a456-426614174002"], status: "cached" });
+  expect(result.enumeration.policy.current_public_cache_bytes).toBe(16);
+  expect(result.enumeration.policy.max_public_cache_bytes).toBe(20);
+  expect(result.enumeration.entries.map((item: { resource_id: string }) => item.resource_id).sort()).toEqual([
+    "123e4567-e89b-42d3-a456-426614174001",
+    "123e4567-e89b-42d3-a456-426614174003",
+  ]);
+  expect(result.enumeration.cache_keys).toHaveLength(2);
+  expect(result.enumeration.indexed_db_names).toEqual(["dada-public-asset-cache-v1"]);
+  expect(result.rejected).toEqual(Array.from({ length: 8 }, () => ({ status: "rejected_not_allowlisted" })));
+  expect(result.local_storage_keys).toEqual([]);
+  expect(result.session_storage_keys).toEqual([]);
+  expect(result.service_workers).toHaveLength(1);
+  expect(publicFetchCount).toBe(3);
+
+  const evidenceDirectory = process.env.DADA_EVIDENCE_DIR_CACHE;
+  if (evidenceDirectory) {
+    mkdirSync(evidenceDirectory, { recursive: true });
+    writeFileSync(resolve(evidenceDirectory, "cache-enumeration.json"), `${JSON.stringify({
+      business_database_calls: 0,
+      public_network_fetches: publicFetchCount,
+      ...result,
+    }, null, 2)}\n`);
+    writeFileSync(resolve(evidenceDirectory, "lru-trace.json"), `${JSON.stringify({
+      capacity_driver: { production_max_bytes: 157_286_400, test_max_bytes: 20 },
+      prewrite_eviction: true,
+      results: result.results,
+    }, null, 2)}\n`);
+  }
+});
diff --git a/tests/unit/wp0-06-public-cache.test.ts b/tests/unit/wp0-06-public-cache.test.ts
new file mode 100644
index 0000000..124830a
--- /dev/null
+++ b/tests/unit/wp0-06-public-cache.test.ts
@@ -0,0 +1,119 @@
+import { createHash } from "node:crypto";
+
+import { describe, expect, it } from "vitest";
+
+import { createApp } from "../../apps/api/src/app.js";
+import {
+  MAX_PUBLIC_CACHE_BYTES,
+  buildPublicAssetUrl,
+  isPublicCacheDescriptor,
+  isPublicServiceWorkerRoute,
+  planPublicCacheWrite,
+  type PublicAssetLruEntry,
+} from "../../apps/web/src/public-asset-cache.js";
+
+const resourceIds = [
+  "123e4567-e89b-42d3-a456-426614174001",
+  "123e4567-e89b-42d3-a456-426614174002",
+  "123e4567-e89b-42d3-a456-426614174003",
+  "123e4567-e89b-42d3-a456-426614174004",
+] as const;
+
+describe("TDD-WP0-CACHE-001 public allowlist LRU", () => {
+  it("freezes the 150 MiB policy and allows exact equality", () => {
+    expect(MAX_PUBLIC_CACHE_BYTES).toBe(157_286_400);
+    const plan = planPublicCacheWrite([], {
+      bytes: MAX_PUBLIC_CACHE_BYTES,
+      last_accessed_at: 4,
+      release_version: "asset-20260727.2",
+      resource_id: resourceIds[0],
+    }, MAX_PUBLIC_CACHE_BYTES);
+    expect(plan).toEqual({ accepted: true, evict: [], resulting_bytes: MAX_PUBLIC_CACHE_BYTES });
+    expect(planPublicCacheWrite([], {
+      bytes: MAX_PUBLIC_CACHE_BYTES + 1,
+      last_accessed_at: 4,
+      release_version: "asset-20260727.2",
+      resource_id: resourceIds[0],
+    }, MAX_PUBLIC_CACHE_BYTES)).toEqual({ accepted: false, evict: [], resulting_bytes: 0 });
+  });
+
+  it("evicts old releases first and then the least recently used entry before writing", () => {
+    const entries: PublicAssetLruEntry[] = [
+      { bytes: 40, last_accessed_at: 30, release_version: "asset-20260727.1", resource_id: resourceIds[0] },
+      { bytes: 40, last_accessed_at: 10, release_version: "asset-20260727.1", resource_id: resourceIds[1] },
+      { bytes: 40, last_accessed_at: 1, release_version: "asset-20260727.2", resource_id: resourceIds[2] },
+    ];
+    const plan = planPublicCacheWrite(entries, {
+      bytes: 40,
+      last_accessed_at: 40,
+      release_version: "asset-20260727.2",
+      resource_id: resourceIds[3],
+    }, 120);
+    expect(plan).toEqual({ accepted: true, evict: [resourceIds[1]], resulting_bytes: 120 });
+  });
+
+  it.each([
+    { access_class: "internal_preview_asset", cache_kind: "thumbnail" },
+    { access_class: "private_user_asset", cache_kind: "thumbnail" },
+    { access_class: "public_release_asset", cache_kind: "sticker_original" },
+    { access_class: "public_release_asset", cache_kind: "generation" },
+    { access_class: "public_release_asset", cache_kind: "export" },
+    { access_class: "public_release_asset", cache_kind: "project" },
+    { access_class: "public_release_asset", cache_kind: "prompt" },
+    { access_class: "public_release_asset", cache_kind: "verification_code" },
+    { access_class: "public_release_asset", cache_kind: "session" },
+    { access_class: "public_release_asset", cache_kind: "unsaved_edit" },
+    { access_class: "public_release_asset", cache_kind: "user_download" },
+  ])("rejects non-allowlisted candidate $access_class/$cache_kind", (candidate) => {
+    expect(isPublicCacheDescriptor({
+      ...candidate,
+      release_version: "asset-20260727.2",
+      resource_id: resourceIds[0],
+    })).toBe(false);
+  });
+
+  it.each(["thumbnail", "template_conversion", "font"] as const)("allows public %s only", (cacheKind) => {
+    expect(isPublicCacheDescriptor({
+      access_class: "public_release_asset",
+      cache_kind: cacheKind,
+      release_version: "asset-20260727.2",
+      resource_id: resourceIds[0],
+    })).toBe(true);
+  });
+
+  it("constructs and intercepts only same-origin versioned public asset routes", () => {
+    const url = buildPublicAssetUrl("asset-20260727.2", resourceIds[0]);
+    expect(url).toBe(`/api/v1/assets/public/asset-20260727.2/${resourceIds[0]}`);
+    expect(isPublicServiceWorkerRoute(new URL(url, "http://127.0.0.1:43121"), "http://127.0.0.1:43121")).toBe(true);
+    for (const path of [
+      `/api/v1/assets/preview/asset-20260727.2/${resourceIds[0]}`,
+      `/api/v1/private-assets/${resourceIds[0]}`,
+      `/api/v1/projects/${resourceIds[0]}`,
+      "/api/v1/support/check",
+      "file:///C:/private.png",
+    ]) {
+      expect(isPublicServiceWorkerRoute(new URL(path, "http://127.0.0.1:43121"), "http://127.0.0.1:43121")).toBe(false);
+    }
+  });
+
+  it("serves existing public binaries as immutable versioned responses with a strong ETag", { timeout: 15_000 }, async () => {
+    const bytes = Buffer.from("public-thumbnail");
+    const sha256 = createHash("sha256").update(bytes).digest("hex");
+    const app = await createApp({
+      browserGate: false,
+      publicAssets: {
+        read: () => ({ assetId: resourceIds[0], bytes, mimeType: "image/png", resourceVersion: "asset-20260727.2", sha256 }),
+      },
+    });
+    const response = await app.inject({
+      headers: { host: "127.0.0.1:43121" },
+      method: "GET",
+      url: `/api/v1/assets/public/asset-20260727.2/${resourceIds[0]}`,
+    });
+    expect(response.statusCode).toBe(200);
+    expect(response.headers["cache-control"]).toBe("public, max-age=31536000, immutable");
+    expect(response.headers.etag).toBe(`"sha256-${sha256}"`);
+    expect(response.headers["x-content-type-options"]).toBe("nosniff");
+    await app.close();
+  });
+});