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-files/tests/integration/helpers/rig.ts

@@ -0,0 +1,142 @@
+import { createShade, type Shade } from '@shade/sdk';
+import {
+  createPrekeyServer,
+  MemoryPrekeyStore,
+  PrekeyServerEvents,
+} from '@shade/server';
+import { SubtleCryptoProvider } from '@shade/crypto-web';
+import {
+  PendingRpcRegistry,
+  ShadeFileRpcChannel,
+  attachClientRouting,
+  attachFileHandler,
+  createClientStreamsBridge,
+  createFileClient,
+  createFileHandler,
+  createServerStreamsBridge,
+  type ClientStreamsBridge,
+  type FileClient,
+  type FileHandler,
+  type FileHandlerConfig,
+  type ServerStreamsBridge,
+} from '../../../src/index.js';
+
+const crypto = new SubtleCryptoProvider();
+
+export interface FileTestRig {
+  alice: Shade;
+  bob: Shade;
+  fs: FileClient;
+  bobHandler: FileHandler;
+  /** Server-side streams bridge (Bob). */
+  bobStreamsBridge: ServerStreamsBridge;
+  /** Client-side streams bridge (Alice). */
+  aliceStreamsBridge: ClientStreamsBridge;
+  /** Tear everything down (kills servers, shuts down shades). */
+  teardown(): Promise<void>;
+}
+
+/**
+ * Setup options.
+ *
+ * Defaults to wiring streams-bridges on both sides so content I/O tests
+ * (`read-write-streams.test.ts`) work transparently. Pass `withStreams: false`
+ * to skip — useful for the legacy `std-ops` tests that don't need them.
+ */
+export interface SetupRigOptions {
+  withStreams?: boolean;
+}
+
+export async function setupFileRig(
+  bobConfig: Omit<FileHandlerConfig, 'streamsBridge'>,
+  options: SetupRigOptions = {},
+): Promise<FileTestRig> {
+  const withStreams = options.withStreams ?? true;
+  // 1. Prekey server
+  const prekeyEvents = new PrekeyServerEvents();
+  const prekey = createPrekeyServer({
+    crypto,
+    store: new MemoryPrekeyStore(),
+    disableRateLimit: true,
+    events: prekeyEvents,
+  });
+  const prekeyServer = Bun.serve({ port: 0, fetch: prekey.fetch });
+  const prekeyUrl = `http://localhost:${prekeyServer.port}`;
+
+  // 2. Two Shades
+  const alice = await createShade({ prekeyServer: prekeyUrl, address: 'alice' });
+  const bob = await createShade({ prekeyServer: prekeyUrl, address: 'bob' });
+
+  // 3. BOTH sides need a transferRoute mounted because file-RPC is
+  //    request/response — Bob's reply must reach Alice's HTTP endpoint
+  //    just as Alice's request reached Bob's.
+  let bobBaseUrl = '';
+  let aliceBaseUrl = '';
+
+  alice.configureTransfers({
+    resolveBaseUrl: async (peer) => {
+      if (peer === 'bob') return bobBaseUrl;
+      throw new Error(`alice: unknown peer ${peer}`);
+    },
+  });
+  bob.configureTransfers({
+    resolveBaseUrl: async (peer) => {
+      if (peer === 'alice') return aliceBaseUrl;
+      throw new Error(`bob: unknown peer ${peer}`);
+    },
+  });
+
+  const bobApp = await bob.transferRoute();
+  const aliceApp = await alice.transferRoute();
+  const bobServer = Bun.serve({ port: 0, fetch: bobApp.fetch });
+  const aliceServer = Bun.serve({ port: 0, fetch: aliceApp.fetch });
+  bobBaseUrl = `http://localhost:${bobServer.port}`;
+  aliceBaseUrl = `http://localhost:${aliceServer.port}`;
+
+  // 4. Streams bridges (both sides) — required for content I/O > 256 KiB.
+  let bobStreamsBridge: ServerStreamsBridge | undefined;
+  let aliceStreamsBridge: ClientStreamsBridge | undefined;
+  if (withStreams) {
+    bobStreamsBridge = await createServerStreamsBridge(bob);
+    aliceStreamsBridge = await createClientStreamsBridge(alice);
+  }
+
+  // 5. Bob: file handler + channel
+  const bobChannel = new ShadeFileRpcChannel(bob);
+  const fullBobConfig: FileHandlerConfig = {
+    ...bobConfig,
+    ...(bobStreamsBridge !== undefined ? { streamsBridge: bobStreamsBridge } : {}),
+  };
+  const bobHandler = createFileHandler(bob, fullBobConfig);
+  attachFileHandler(bobChannel, bobHandler);
+
+  // 6. Alice: client + channel + pending registry
+  const aliceChannel = new ShadeFileRpcChannel(alice);
+  const alicePending = new PendingRpcRegistry();
+  attachClientRouting(aliceChannel, alicePending);
+  const fs = createFileClient(alice, aliceChannel, alicePending, 'bob', {
+    defaultTimeoutMs: 5000,
+    ...(aliceStreamsBridge !== undefined ? { streamsBridge: aliceStreamsBridge } : {}),
+  });
+
+  return {
+    alice,
+    bob,
+    fs,
+    bobHandler,
+    bobStreamsBridge: bobStreamsBridge as ServerStreamsBridge,
+    aliceStreamsBridge: aliceStreamsBridge as ClientStreamsBridge,
+    async teardown() {
+      bobChannel.destroy();
+      aliceChannel.destroy();
+      bobHandler.destroy();
+      if (bobStreamsBridge !== undefined) await bobStreamsBridge.destroy();
+      if (aliceStreamsBridge !== undefined) await aliceStreamsBridge.destroy();
+      await alice.shutdown();
+      await bob.shutdown();
+      bobServer.stop();
+      aliceServer.stop();
+      prekeyServer.stop();
+    },
+  };
+}