feat(files): @shade/files 0.3.0 — E2EE filesystem RPC primitive

M-Files-1..6 land the full files-RPC layer + everything 0.3.0 needs to
ship. Apps keep their own UI; this layer ships the typed RPC, the
streams bridge for content I/O, and production hooks (rate limit,
retention, fingerprint gate, metrics).

@shade/files (NEW)
- Standard ops: list/stat/mkdir/delete/move/read/write/getThumbnail with
  Zod-validated wire schemas + clean user-handler types.
- Custom ops: typed via TypeScript declaration merging on CustomOpsMap
  + per-op Zod schemas; client.custom('app.foo', {...}) is fully typed.
- Content I/O: inline (≤ 256 KiB plaintext) base64-in-RPC; streams
  (> 256 KiB) ride @shade/transfer via userMetadata.shadeFilesWriteId
  / shadeFilesReadStreamId correlation. Server-side TransformStream
  bridges accept inbound transfers immediately (engine rejects chunks
  that arrive before accept) and park the readable for the matching
  RPC.
- Directory ops: walk(path, opts) async-iterable depth-first walker;
  uploadDirectory()/downloadDirectory() with bounded concurrency pool
  (default 4, cap 16), aggregated progress, abort.
- Production hooks (callback-based, vendor-neutral): rate-limit (op +
  byte), idempotency cache (LRU + TTL + in-flight de-dupe), path
  policy (traversal + percent-decode hardening), fingerprint gate
  (required/optional/reject), pluggable Ed25519 sig verification with
  ±5 min replay window, onMetric sink (standard names).
- React hooks (subpath @shade/files/react): ShadeFilesProvider,
  useShadeFiles, useFileList, useFileTransfer/Upload/Download.
- Shade.files.serve(handler) + Shade.files.client(peer) high-level
  entrypoint in @shade/sdk; lazy + memoized; one handler per Shade.

Wire format bump
- @shade/proto wire VERSION 0x01 → 0x02. Length prefixes changed from
  u16 to u32. The previous u16 silently truncated payloads above
  64 KiB — a hard correctness ceiling that blocked inline file ops
  up to 256 KiB. Wire-incompatible with 0.2.x peers; new sessions
  only. Cross-platform Kotlin port (android/shade-android) updated to
  match; test-vectors/wire-format.json regenerated.

Concurrency safety
- ShadeSessionManager.encrypt/.decrypt now run under per-peer mutex.
  Concurrent decryptions of the same peer raced ratchet state
  (manifested as sporadic "Failed to decrypt — wrong key or tampered
  data" under load — surfaced once concurrent uploadDirectory pumped
  many writes in flight). Encrypt was already serialized via
  Shade.send's encryptChains; decrypt is now serialized at the
  manager layer too.

@shade/streams extension
- StreamMetadata.userMetadata?: Record<string, string> for
  application-level key/value pairs that round-trip verbatim through
  stream-init plaintext. Used by @shade/files for write/read
  correlation; available to any consumer.

@shade/sdk extension
- Shade.files getter (lazy + memoized).
- BackgroundHooks.onPruneFiles + periodic timer (default 5 min) +
  BackgroundTasks.setHook(name, fn) for runtime hook registration.

Bundles in-flight 0.2.0 work
- packages/shade-streams/, packages/shade-transfer/, related
  shade-sdk streams-bridge + shade-widgets transfer hooks were
  uncommitted prior to this session. Including them keeps the
  workspace consistent at 0.3.0 since @shade/files depends on them.

Tests
- 74 new tests in @shade/files (572 → 646 workspace pass; 0 fail;
  3× stable). Coverage spans unit (inline-threshold + concurrency),
  integration (read-write inline + streams up to 1 MiB, walk +
  upload/download directory, custom-op, metrics, SDK namespace
  end-to-end), and security (tampered-envelope sig verification,
  replay window, fingerprint gate, rate-limit + quota).

Release artifacts
- All packages bumped to 0.3.0 via scripts/bump-version.ts.
- scripts/publish-all.ts PACKAGES updated with shade-files in
  topological order (after shade-transfer, before shade-sdk).
- bun run publish:dry clean (14 packed, 0 failed).
- examples/08-files-browser/ — three-process CLI demo (prekey + Bob
  server + Alice CLI) covering list/stat/mkdir/delete/upload/download.
- docs/files.md — full API + design doc.
- CHANGELOG.md 0.3.0 entry.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

packages/shade-sdk/tests/streams-integration.test.ts

@@ -0,0 +1,159 @@
+import { describe, test, expect, beforeAll, afterAll } from 'bun:test';
+import { createShade, type Shade, type TransferHandle, type TransferResult } from '../src/index.js';
+import {
+  createPrekeyServer,
+  MemoryPrekeyStore,
+  PrekeyServerEvents,
+} from '@shade/server';
+import { SubtleCryptoProvider } from '@shade/crypto-web';
+import { sha256Once } from '@shade/streams';
+
+const crypto = new SubtleCryptoProvider();
+
+interface TestRig {
+  alice: Shade;
+  bob: Shade;
+  bobBaseUrl: string;
+  prekeyStop: () => void;
+  bobServerStop: () => void;
+}
+
+async function startPrekeyServer(): Promise<{ url: string; stop: () => void }> {
+  const events = new PrekeyServerEvents();
+  const server = createPrekeyServer({
+    crypto,
+    store: new MemoryPrekeyStore(),
+    disableRateLimit: true,
+    events,
+  });
+  const port = 21000 + Math.floor(Math.random() * 500);
+  const handle = Bun.serve({ port, fetch: server.fetch });
+  return { url: `http://localhost:${port}`, stop: () => handle.stop() };
+}
+
+async function setupRig(): Promise<TestRig> {
+  const prekey = await startPrekeyServer();
+  const alice = await createShade({ prekeyServer: prekey.url, address: 'alice' });
+  const bob = await createShade({ prekeyServer: prekey.url, address: 'bob' });
+
+  // Bob's transferRoute lazily creates a TransferEngine, which requires
+  // configureTransfers first.
+  bob.configureTransfers({
+    resolveBaseUrl: async () => {
+      throw new Error('bob is receive-only in this test');
+    },
+  });
+
+  // Spin up Bob's HTTP transfer endpoint.
+  const bobApp = await bob.transferRoute();
+  const port = 21500 + Math.floor(Math.random() * 500);
+  const bobServer = Bun.serve({ port, fetch: bobApp.fetch });
+  const bobBaseUrl = `http://localhost:${port}`;
+
+  // Wire up Alice's outgoing transfer routing.
+  alice.configureTransfers({
+    resolveBaseUrl: async (addr) => {
+      if (addr === 'bob') return bobBaseUrl;
+      throw new Error(`unknown peer ${addr}`);
+    },
+  });
+
+  return {
+    alice,
+    bob,
+    bobBaseUrl,
+    prekeyStop: prekey.stop,
+    bobServerStop: () => bobServer.stop(),
+  };
+}
+
+async function teardownRig(rig: TestRig): Promise<void> {
+  await rig.alice.shutdown();
+  await rig.bob.shutdown();
+  rig.bobServerStop();
+  rig.prekeyStop();
+}
+
+function hex(b: Uint8Array): string {
+  return Array.from(b, (x) => x.toString(16).padStart(2, '0')).join('');
+}
+
+async function uploadAndAwait(
+  rig: TestRig,
+  input: Uint8Array,
+  opts?: { lanes?: number; chunkSize?: number },
+): Promise<{ senderResult: TransferResult; received: Uint8Array }> {
+  let resolveRecv!: (h: TransferHandle) => void;
+  const recvHandlePromise = new Promise<TransferHandle>((r) => {
+    resolveRecv = r;
+  });
+  const unsubscribe = await rig.bob.onIncomingTransfer(async (incoming) => {
+    const h = await incoming.accept({ output: { kind: 'buffer' } });
+    resolveRecv(h);
+  });
+
+  const handle = await rig.alice.upload({
+    to: 'bob',
+    input,
+    ...(opts?.lanes !== undefined ? { lanes: opts.lanes } : {}),
+    ...(opts?.chunkSize !== undefined ? { chunkSize: opts.chunkSize } : {}),
+    metadata: { name: 'integration-test.bin' },
+  });
+  const recvHandle = await recvHandlePromise;
+  const [senderResult, recvResult] = await Promise.all([handle.done(), recvHandle.done()]);
+  unsubscribe();
+  const received =
+    (recvResult as TransferResult & { bytes?: Uint8Array }).bytes ?? new Uint8Array();
+  return { senderResult, received };
+}
+
+describe('Shade SDK end-to-end E2EE transfer', () => {
+  let rig: TestRig;
+  beforeAll(async () => {
+    rig = await setupRig();
+  });
+  afterAll(async () => {
+    await teardownRig(rig);
+  });
+
+  test('64 KiB payload — 1 lane', async () => {
+    const input = crypto.randomBytes(64 * 1024);
+    const { senderResult, received } = await uploadAndAwait(rig, input, {
+      lanes: 1,
+      chunkSize: 16 * 1024,
+    });
+    expect(received).toEqual(input);
+    expect(senderResult.sha256).toBe(hex(sha256Once(input)));
+  });
+
+  test('512 KiB payload — 4 lanes range partition', async () => {
+    const input = crypto.randomBytes(512 * 1024);
+    const { senderResult, received } = await uploadAndAwait(rig, input, {
+      lanes: 4,
+      chunkSize: 32 * 1024,
+    });
+    expect(received).toEqual(input);
+    expect(senderResult.sha256).toBe(hex(sha256Once(input)));
+  });
+
+  test(
+    '4 MiB payload — 4 lanes, simulates Dispatch upload',
+    async () => {
+      const input = crypto.randomBytes(4 * 1024 * 1024);
+      const { senderResult, received } = await uploadAndAwait(rig, input, {
+        lanes: 4,
+        chunkSize: 128 * 1024,
+      });
+      expect(received).toEqual(input);
+      expect(senderResult.sha256).toBe(hex(sha256Once(input)));
+    },
+    30_000,
+  );
+
+  test('listTransfers returns empty before transfer (memory storage)', async () => {
+    // MemoryStorage's listActiveStreamStates is implemented but never
+    // populated by the engine in v0.2.0 (resume persistence is M-Stream-6).
+    const list = await rig.alice.listTransfers();
+    expect(Array.isArray(list)).toBe(true);
+  });
+});