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/src/client/upload-directory.ts

@@ -0,0 +1,310 @@
+/**
+ * Upload an entire local directory tree to a remote peer via a `FileClient`.
+ *
+ * Walks the local `DirectoryHandleLike` lazily, creates remote directories
+ * via `client.mkdir({ recursive: true })`, and uploads each file with
+ * `client.write` (which routes inline or streams based on size). A bounded
+ * concurrency pool keeps memory and inflight RPCs in check.
+ *
+ * Returns a `BulkTransferHandle` whose `events` stream emits `'plan'`,
+ * `'file-start'`, `'file-progress'` (currently emitted at file start +
+ * end), `'file-done'` / `'file-error'`, aggregate `'progress'`, and a
+ * final `'complete'` (or `'abort'`).
+ */
+import { posixJoin } from '../utils/path.js';
+import { runWithConcurrency } from './concurrency.js';
+import type { FileClient } from './client.js';
+import {
+  DEFAULT_BULK_CONCURRENCY,
+  MAX_BULK_CONCURRENCY,
+  type BulkOpts,
+  type BulkTransferEvent,
+  type BulkTransferHandle,
+  type BulkTransferResult,
+  type DirectoryHandleLike,
+  type FileHandleLike,
+} from './directory-types.js';
+import { CancelledError } from '../schemas/errors.js';
+
+interface PlannedFile {
+  /** Local file handle. */
+  handle: FileHandleLike;
+  /** Path relative to the upload root. */
+  relativePath: string;
+  /** Absolute remote path. */
+  remoteAbsPath: string;
+}
+
+interface PlannedDir {
+  remoteAbsPath: string;
+}
+
+export interface UploadDirectoryOptions extends BulkOpts {
+  /**
+   * Pre-create remote directories before uploading files. Default true.
+   * Disable if the server-side `write` already mkdir-p's parents.
+   */
+  precreateDirs?: boolean;
+}
+
+export function uploadDirectory(
+  client: Pick<FileClient, 'write' | 'mkdir'>,
+  local: DirectoryHandleLike,
+  remoteRoot: string,
+  opts: UploadDirectoryOptions = {},
+): BulkTransferHandle {
+  const concurrency = Math.max(
+    1,
+    Math.min(MAX_BULK_CONCURRENCY, opts.concurrency ?? DEFAULT_BULK_CONCURRENCY),
+  );
+  const precreateDirs = opts.precreateDirs ?? true;
+  const continueOnError = opts.continueOnError ?? false;
+  const externalSignal = opts.signal;
+
+  const internalAbort = new AbortController();
+  const combinedSignal = mergeSignals(externalSignal, internalAbort.signal);
+
+  const events: BulkTransferEvent[] = [];
+  const eventResolvers: ((v: IteratorResult<BulkTransferEvent>) => void)[] = [];
+  let eventsClosed = false;
+
+  function emit(event: BulkTransferEvent): void {
+    if (eventsClosed) return;
+    if (eventResolvers.length > 0) {
+      eventResolvers.shift()!({ value: event, done: false });
+    } else {
+      events.push(event);
+    }
+  }
+
+  function closeEvents(): void {
+    if (eventsClosed) return;
+    eventsClosed = true;
+    while (eventResolvers.length > 0) {
+      eventResolvers.shift()!({ value: undefined as never, done: true });
+    }
+  }
+
+  let resolveDone!: (r: BulkTransferResult) => void;
+  let rejectDone!: (err: unknown) => void;
+  const donePromise = new Promise<BulkTransferResult>((resolve, reject) => {
+    resolveDone = resolve;
+    rejectDone = reject;
+  });
+
+  const startedAt = Date.now();
+  let filesDone = 0;
+  let bytesDone = 0;
+  let bytesTotal = 0;
+
+  // Run the upload pipeline asynchronously.
+  void (async () => {
+    try {
+      // 1. Plan: walk local tree, collect dirs + files
+      const plannedDirs: PlannedDir[] = [];
+      const plannedFiles: PlannedFile[] = [];
+      try {
+        await collect(local, '', remoteRoot, plannedDirs, plannedFiles, combinedSignal);
+      } catch (err) {
+        emit({ type: 'abort', reason: errMsg(err) });
+        closeEvents();
+        rejectDone(err);
+        return;
+      }
+
+      const totalFiles = plannedFiles.length;
+      bytesTotal = plannedFiles.reduce(
+        (acc, f) => acc + (f.handle as FileHandleLike & { _size?: number })._size!,
+        0,
+      );
+      // Note: bytesTotal is computed lazily in collect() via cached sizes.
+
+      emit({ type: 'plan', totalFiles, totalBytes: bytesTotal });
+
+      if (combinedSignal.aborted) {
+        emit({ type: 'abort', reason: errMsg(combinedSignal.reason) });
+        closeEvents();
+        rejectDone(combinedSignal.reason ?? new CancelledError());
+        return;
+      }
+
+      // 2. Pre-create remote directories sequentially (cheap, avoids races
+      //    when many uploads target the same parent).
+      if (precreateDirs) {
+        for (const d of plannedDirs) {
+          if (combinedSignal.aborted) break;
+          try {
+            await client.mkdir(d.remoteAbsPath, { recursive: true });
+          } catch (err) {
+            if (!isAlreadyExistsError(err)) {
+              if (!continueOnError) {
+                emit({ type: 'abort', reason: errMsg(err) });
+                closeEvents();
+                rejectDone(err);
+                return;
+              }
+            }
+          }
+        }
+      }
+
+      // 3. Upload files with bounded concurrency
+      try {
+        await runWithConcurrency(
+          asyncIterableOf(plannedFiles),
+          async (planned) => {
+            if (combinedSignal.aborted) {
+              throw new CancelledError('upload aborted');
+            }
+            const file = await planned.handle.getFile();
+            const size = file.size;
+            emit({ type: 'file-start', path: planned.relativePath, size });
+            try {
+              const writeOpts: { contentType?: string; signal?: AbortSignal } = {};
+              if (file.type !== '') writeOpts.contentType = file.type;
+              writeOpts.signal = combinedSignal;
+              if (size === 0) {
+                // Edge case: empty file — write empty buffer.
+                await client.write(planned.remoteAbsPath, new Uint8Array(0), writeOpts);
+              } else {
+                await client.write(
+                  planned.remoteAbsPath,
+                  { stream: file.stream(), size, ...(file.type !== '' ? { contentType: file.type } : {}) },
+                  writeOpts,
+                );
+              }
+              filesDone++;
+              bytesDone += size;
+              emit({ type: 'file-done', path: planned.relativePath, bytesDone: size });
+              emit({
+                type: 'progress',
+                filesDone,
+                filesTotal: totalFiles,
+                bytesDone,
+                bytesTotal,
+              });
+            } catch (err) {
+              emit({ type: 'file-error', path: planned.relativePath, error: err });
+              throw err;
+            }
+          },
+          {
+            concurrency,
+            signal: combinedSignal,
+            continueOnError,
+            onError: () => {
+              /* already emitted as 'file-error' */
+            },
+          },
+        );
+      } catch (err) {
+        emit({ type: 'abort', reason: errMsg(err) });
+        closeEvents();
+        rejectDone(err);
+        return;
+      }
+
+      const durationMs = Date.now() - startedAt;
+      emit({ type: 'complete', filesDone, bytesDone, durationMs });
+      closeEvents();
+      resolveDone({ filesDone, bytesDone, durationMs });
+    } catch (err) {
+      // Belt-and-suspenders: any unhandled error reaches here.
+      closeEvents();
+      rejectDone(err);
+    }
+  })();
+
+  // Suppress unhandled-rejection until consumer awaits done().
+  donePromise.catch(() => {
+    /* deliberate */
+  });
+
+  return {
+    events: {
+      [Symbol.asyncIterator]() {
+        return {
+          next(): Promise<IteratorResult<BulkTransferEvent>> {
+            if (events.length > 0) {
+              return Promise.resolve({ value: events.shift()!, done: false });
+            }
+            if (eventsClosed) {
+              return Promise.resolve({ value: undefined as never, done: true });
+            }
+            return new Promise((resolve) => eventResolvers.push(resolve));
+          },
+          return(): Promise<IteratorResult<BulkTransferEvent>> {
+            // Caller broke out — stop iterating but keep the bulk going.
+            return Promise.resolve({ value: undefined as never, done: true });
+          },
+        };
+      },
+    },
+    async abort(reason) {
+      internalAbort.abort(new CancelledError(reason ?? 'manual abort'));
+    },
+    done: () => donePromise,
+  };
+}
+
+// ─── Helpers ─────────────────────────────────────────────────
+
+async function collect(
+  dir: DirectoryHandleLike,
+  relPrefix: string,
+  remoteRoot: string,
+  plannedDirs: PlannedDir[],
+  plannedFiles: PlannedFile[],
+  signal: AbortSignal,
+): Promise<void> {
+  for await (const [name, handle] of dir.entries()) {
+    if (signal.aborted) return;
+    const relPath = relPrefix === '' ? name : `${relPrefix}/${name}`;
+    if (handle.kind === 'directory') {
+      const remoteAbs = posixJoin(remoteRoot, relPath);
+      plannedDirs.push({ remoteAbsPath: remoteAbs });
+      await collect(handle as DirectoryHandleLike, relPath, remoteRoot, plannedDirs, plannedFiles, signal);
+    } else {
+      // Cache size on the handle so the planning total is accurate.
+      const file = await (handle as FileHandleLike).getFile();
+      (handle as FileHandleLike & { _size?: number })._size = file.size;
+      plannedFiles.push({
+        handle: handle as FileHandleLike,
+        relativePath: relPath,
+        remoteAbsPath: posixJoin(remoteRoot, relPath),
+      });
+    }
+  }
+}
+
+async function* asyncIterableOf<T>(arr: T[]): AsyncIterable<T> {
+  for (const item of arr) yield item;
+}
+
+function isAlreadyExistsError(err: unknown): boolean {
+  if (err === null || typeof err !== 'object') return false;
+  const code = (err as { code?: string; payload?: { code?: string } }).code;
+  if (code === 'SHADE_FS_CONFLICT') return true;
+  const payloadCode = (err as { payload?: { code?: string } }).payload?.code;
+  return payloadCode === 'CONFLICT';
+}
+
+function errMsg(err: unknown): string {
+  if (err instanceof Error) return err.message;
+  return String(err ?? 'unknown error');
+}
+
+function mergeSignals(
+  external: AbortSignal | undefined,
+  internal: AbortSignal,
+): AbortSignal {
+  if (external === undefined) return internal;
+  if (external.aborted) return external;
+  const controller = new AbortController();
+  const onAbort = (sig: AbortSignal): void => {
+    controller.abort(sig.reason);
+  };
+  external.addEventListener('abort', () => onAbort(external), { once: true });
+  internal.addEventListener('abort', () => onAbort(internal), { once: true });
+  return controller.signal;
+}