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/std-ops.test.ts

@@ -0,0 +1,199 @@
+import { describe, test, expect, beforeAll, afterAll } from 'bun:test';
+import {
+  ConflictError,
+  IdempotencyConflictError,
+  NotFoundError,
+  PermissionDeniedError,
+  type FileEntry,
+} from '../../src/index.js';
+import { setupFileRig, type FileTestRig } from './helpers/rig.js';
+
+describe('Standard ops — list/stat/mkdir/delete/move E2E', () => {
+  let rig: FileTestRig;
+  // Simple in-memory backing store on Bob.
+  const tree = new Map<string, FileEntry>();
+
+  beforeAll(async () => {
+    tree.clear();
+    tree.set('/', { name: '', kind: 'dir', size: 0, mtime: 0, metadata: {} });
+    tree.set('/foo', { name: 'foo', kind: 'dir', size: 0, mtime: 100, metadata: {} });
+    tree.set('/foo/bar.txt', {
+      name: 'bar.txt',
+      kind: 'file',
+      size: 12,
+      mtime: 200,
+      contentType: 'text/plain',
+      metadata: {},
+    });
+    tree.set('/foo/baz.txt', {
+      name: 'baz.txt',
+      kind: 'file',
+      size: 5,
+      mtime: 300,
+      metadata: {},
+    });
+
+    rig = await setupFileRig({
+      list: async (ctx) => {
+        const dir = ctx.path;
+        const entries: FileEntry[] = [];
+        for (const [path, entry] of tree) {
+          if (path === dir) continue;
+          if (!path.startsWith(dir === '/' ? '/' : dir + '/')) continue;
+          const rest = path.slice(dir === '/' ? 1 : dir.length + 1);
+          if (rest.includes('/')) continue;
+          entries.push(entry);
+        }
+        return { entries, hasMore: false };
+      },
+      stat: async (ctx) => {
+        const e = tree.get(ctx.path);
+        if (e === undefined) throw new NotFoundError(`${ctx.path} not found`);
+        return e;
+      },
+      mkdir: async (ctx) => {
+        if (tree.has(ctx.path)) throw new ConflictError(`${ctx.path} exists`);
+        const name = ctx.path.split('/').filter(Boolean).pop() ?? '';
+        const entry: FileEntry = {
+          name,
+          kind: 'dir',
+          size: 0,
+          mtime: Date.now(),
+          metadata: {},
+        };
+        tree.set(ctx.path, entry);
+        return { entry };
+      },
+      delete: async (ctx) => {
+        if (!tree.has(ctx.path)) throw new NotFoundError(ctx.path);
+        let count = 0;
+        if (ctx.args.recursive) {
+          for (const path of [...tree.keys()]) {
+            if (path === ctx.path || path.startsWith(ctx.path + '/')) {
+              tree.delete(path);
+              count++;
+            }
+          }
+        } else {
+          tree.delete(ctx.path);
+          count = 1;
+        }
+        return { deletedCount: count };
+      },
+      move: async (ctx) => {
+        const src = ctx.args.src;
+        const dst = ctx.args.dst;
+        const e = tree.get(src);
+        if (e === undefined) throw new NotFoundError(src);
+        if (tree.has(dst) && !ctx.args.overwrite) {
+          throw new ConflictError(`${dst} exists`);
+        }
+        const newName = dst.split('/').filter(Boolean).pop() ?? e.name;
+        tree.delete(src);
+        tree.set(dst, { ...e, name: newName });
+        return { entry: tree.get(dst)! };
+      },
+    });
+  });
+
+  afterAll(async () => {
+    await rig.teardown();
+  });
+
+  test('list /', async () => {
+    const page = await rig.fs.list('/');
+    expect(page.hasMore).toBe(false);
+    const names = page.entries.map((e) => e.name).sort();
+    expect(names).toEqual(['foo']);
+  });
+
+  test('list /foo', async () => {
+    const page = await rig.fs.list('/foo');
+    const names = page.entries.map((e) => e.name).sort();
+    expect(names).toEqual(['bar.txt', 'baz.txt']);
+  });
+
+  test('stat existing file', async () => {
+    const e = await rig.fs.stat('/foo/bar.txt');
+    expect(e.size).toBe(12);
+    expect(e.contentType).toBe('text/plain');
+  });
+
+  test('stat missing → NotFoundError', async () => {
+    let caught: unknown = null;
+    try {
+      await rig.fs.stat('/no/such/file');
+    } catch (err) {
+      caught = err;
+    }
+    expect(caught instanceof NotFoundError).toBe(true);
+    expect((caught as NotFoundError).payload.code).toBe('NOT_FOUND');
+  });
+
+  test('mkdir creates a new directory', async () => {
+    const result = await rig.fs.mkdir('/created');
+    expect(result.entry.kind).toBe('dir');
+    expect(tree.has('/created')).toBe(true);
+  });
+
+  test('mkdir on existing path → ConflictError', async () => {
+    await expect(rig.fs.mkdir('/foo')).rejects.toBeInstanceOf(ConflictError);
+  });
+
+  test('delete file', async () => {
+    tree.set('/temp.txt', { name: 'temp.txt', kind: 'file', size: 0, mtime: 0, metadata: {} });
+    const r = await rig.fs.delete('/temp.txt');
+    expect(r.deletedCount).toBe(1);
+    expect(tree.has('/temp.txt')).toBe(false);
+  });
+
+  test('delete missing → NotFoundError', async () => {
+    await expect(rig.fs.delete('/doesnt-exist')).rejects.toBeInstanceOf(NotFoundError);
+  });
+
+  test('move file', async () => {
+    tree.set('/x.txt', { name: 'x.txt', kind: 'file', size: 0, mtime: 0, metadata: {} });
+    const r = await rig.fs.move('/x.txt', '/y.txt');
+    expect(r.entry.name).toBe('y.txt');
+    expect(tree.has('/x.txt')).toBe(false);
+    expect(tree.has('/y.txt')).toBe(true);
+  });
+
+  test('move overwrite=false → ConflictError on collision', async () => {
+    tree.set('/a.txt', { name: 'a.txt', kind: 'file', size: 0, mtime: 0, metadata: {} });
+    tree.set('/b.txt', { name: 'b.txt', kind: 'file', size: 0, mtime: 0, metadata: {} });
+    await expect(rig.fs.move('/a.txt', '/b.txt')).rejects.toBeInstanceOf(ConflictError);
+  });
+
+  test('idempotent retry: same key + same args → cached response', async () => {
+    tree.set('/idem.txt', { name: 'idem.txt', kind: 'file', size: 0, mtime: 0, metadata: {} });
+    const key = 'IdemKey1AaBbCcDdEeFfGg'; // 22 chars
+    const r1 = await rig.fs.delete('/idem.txt', { idempotencyKey: key });
+    expect(r1.deletedCount).toBe(1);
+    // 2nd call with same key → same result without throwing NotFound
+    const r2 = await rig.fs.delete('/idem.txt', { idempotencyKey: key });
+    expect(r2.deletedCount).toBe(1);
+  });
+
+  test('idempotency conflict: same key + different args', async () => {
+    tree.set('/c1.txt', { name: 'c1.txt', kind: 'file', size: 0, mtime: 0, metadata: {} });
+    tree.set('/c2.txt', { name: 'c2.txt', kind: 'file', size: 0, mtime: 0, metadata: {} });
+    const key = 'ConflictKeyAaBbCcDdEeF'; // 22 chars
+    await rig.fs.delete('/c1.txt', { idempotencyKey: key });
+    await expect(
+      rig.fs.delete('/c2.txt', { idempotencyKey: key }),
+    ).rejects.toBeInstanceOf(IdempotencyConflictError);
+  });
+
+  test('path validation: traversal rejected by server', async () => {
+    await expect(rig.fs.list('/foo')).resolves.toBeDefined();
+    // Client-side schema rejects traversal too — bypass via direct bad path:
+    await expect(rig.fs.stat('/foo/../etc')).rejects.toThrow();
+  });
+
+  // We don't test PermissionDenied here (no beforeOp gate configured),
+  // but the type is referenced to ensure it's exported properly.
+  test('PermissionDeniedError is exported', () => {
+    expect(PermissionDeniedError).toBeDefined();
+  });
+});