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-storage-sqlite/src/sqlite-storage.ts

@@ -1,5 +1,5 @@
 import { Database } from 'bun:sqlite';
-import type { StorageProvider, IdentityKeyPair, SignedPreKey, OneTimePreKey, SessionState, RetiredIdentity } from '@shade/core';
+import type { StorageProvider, IdentityKeyPair, SignedPreKey, OneTimePreKey, SessionState, RetiredIdentity, PersistedStreamState } from '@shade/core';
 import {
   toBase64, fromBase64,
   constantTimeEqual,
@@ -42,6 +42,12 @@ export class SQLiteStorage implements StorageProvider {
     addRetired: ReturnType<Database['prepare']>;
     listRetired: ReturnType<Database['prepare']>;
     pruneRetired: ReturnType<Database['prepare']>;
+    saveStreamState: ReturnType<Database['prepare']>;
+    getStreamState: ReturnType<Database['prepare']>;
+    removeStreamState: ReturnType<Database['prepare']>;
+    listActiveStreamStates: ReturnType<Database['prepare']>;
+    listActiveStreamStatesByDirection: ReturnType<Database['prepare']>;
+    pruneStreamStates: ReturnType<Database['prepare']>;
   };
 
   constructor(dbPath?: string) {
@@ -87,6 +93,24 @@ export class SQLiteStorage implements StorageProvider {
         retired_at INTEGER NOT NULL
       );
       CREATE INDEX IF NOT EXISTS idx_retired_at ON retired_identities(retired_at);
+      CREATE TABLE IF NOT EXISTS stream_state (
+        stream_id          TEXT PRIMARY KEY,
+        direction          TEXT NOT NULL,
+        peer_address       TEXT NOT NULL,
+        status             TEXT NOT NULL,
+        metadata_json      TEXT NOT NULL,
+        partition_json     TEXT NOT NULL,
+        lane_state_json    TEXT NOT NULL,
+        io_descriptor_json TEXT NOT NULL,
+        secret_enc         BLOB NOT NULL,
+        secret_nonce       BLOB NOT NULL,
+        overall_hash_state TEXT,
+        created_at         INTEGER NOT NULL,
+        updated_at         INTEGER NOT NULL
+      );
+      CREATE INDEX IF NOT EXISTS idx_stream_state_peer    ON stream_state(peer_address);
+      CREATE INDEX IF NOT EXISTS idx_stream_state_updated ON stream_state(updated_at);
+      CREATE INDEX IF NOT EXISTS idx_stream_state_status  ON stream_state(status, direction);
     `);
   }
 
@@ -111,6 +135,24 @@ export class SQLiteStorage implements StorageProvider {
       addRetired: this.db.prepare('INSERT INTO retired_identities (data_json, retired_at) VALUES (?, ?)'),
       listRetired: this.db.prepare('SELECT data_json, retired_at FROM retired_identities ORDER BY retired_at DESC'),
       pruneRetired: this.db.prepare('DELETE FROM retired_identities WHERE retired_at < ?'),
+      saveStreamState: this.db.prepare(
+        `INSERT OR REPLACE INTO stream_state (
+           stream_id, direction, peer_address, status,
+           metadata_json, partition_json, lane_state_json, io_descriptor_json,
+           secret_enc, secret_nonce, overall_hash_state, created_at, updated_at
+         ) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)`,
+      ),
+      getStreamState: this.db.prepare('SELECT * FROM stream_state WHERE stream_id = ?'),
+      removeStreamState: this.db.prepare('DELETE FROM stream_state WHERE stream_id = ?'),
+      listActiveStreamStates: this.db.prepare(
+        "SELECT * FROM stream_state WHERE status IN ('active', 'paused') ORDER BY updated_at DESC",
+      ),
+      listActiveStreamStatesByDirection: this.db.prepare(
+        "SELECT * FROM stream_state WHERE status IN ('active', 'paused') AND direction = ? ORDER BY updated_at DESC",
+      ),
+      pruneStreamStates: this.db.prepare(
+        "DELETE FROM stream_state WHERE status IN ('finished', 'aborted') AND updated_at < ?",
+      ),
     };
   }
 
@@ -235,4 +277,78 @@ export class SQLiteStorage implements StorageProvider {
   async pruneRetiredIdentities(olderThan: number): Promise<void> {
     this.stmts.pruneRetired.run(olderThan);
   }
+
+  // ─── Stream-transfer resume state (v0.2.0) ────────────────
+
+  async saveStreamState(state: PersistedStreamState): Promise<void> {
+    this.stmts.saveStreamState.run(
+      state.streamId,
+      state.direction,
+      state.peerAddress,
+      state.status,
+      state.metadataJson,
+      state.partitionJson,
+      state.laneStateJson,
+      state.ioDescriptorJson,
+      state.secretEnc,
+      state.secretNonce,
+      state.overallHashState ?? null,
+      state.createdAt,
+      state.updatedAt,
+    );
+  }
+
+  async getStreamState(streamId: string): Promise<PersistedStreamState | null> {
+    const row = this.stmts.getStreamState.get(streamId) as any;
+    if (!row) return null;
+    return rowToStreamState(row);
+  }
+
+  async removeStreamState(streamId: string): Promise<void> {
+    this.stmts.removeStreamState.run(streamId);
+  }
+
+  async listActiveStreamStates(direction?: 'send' | 'receive'): Promise<PersistedStreamState[]> {
+    const rows = (
+      direction === undefined
+        ? (this.stmts.listActiveStreamStates.all() as any[])
+        : (this.stmts.listActiveStreamStatesByDirection.all(direction) as any[])
+    );
+    return rows.map(rowToStreamState);
+  }
+
+  async pruneStreamStates(olderThan: number): Promise<void> {
+    this.stmts.pruneStreamStates.run(olderThan);
+  }
+}
+
+function rowToStreamState(row: any): PersistedStreamState {
+  const out: PersistedStreamState = {
+    streamId: row.stream_id,
+    direction: row.direction,
+    peerAddress: row.peer_address,
+    status: row.status,
+    metadataJson: row.metadata_json,
+    partitionJson: row.partition_json,
+    laneStateJson: row.lane_state_json,
+    ioDescriptorJson: row.io_descriptor_json,
+    secretEnc: toBytes(row.secret_enc),
+    secretNonce: toBytes(row.secret_nonce),
+    createdAt: Number(row.created_at),
+    updatedAt: Number(row.updated_at),
+  };
+  if (row.overall_hash_state !== null && row.overall_hash_state !== undefined) {
+    out.overallHashState = row.overall_hash_state;
+  }
+  return out;
+}
+
+function toBytes(value: unknown): Uint8Array {
+  if (value instanceof Uint8Array) return value;
+  if (value instanceof ArrayBuffer) return new Uint8Array(value);
+  if (Array.isArray(value)) return new Uint8Array(value);
+  if (typeof value === 'string') {
+    return new Uint8Array(value.split('').map((c) => c.charCodeAt(0)));
+  }
+  throw new Error(`Unsupported BLOB representation: ${typeof value}`);
 }