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-postgres/src/ensure-tables.ts

@@ -59,6 +59,35 @@ export async function ensureClientTables(sql: Sql): Promise<void> {
   await sql`
     CREATE INDEX IF NOT EXISTS shade_retired_at_idx ON shade_retired_identities(retired_at)
   `;
+  await sql`
+    CREATE TABLE IF NOT EXISTS shade_stream_state (
+      stream_id          TEXT PRIMARY KEY,
+      direction          TEXT NOT NULL CHECK (direction IN ('send','receive')),
+      peer_address       TEXT NOT NULL,
+      status             TEXT NOT NULL CHECK (status IN ('active','paused','finished','aborted')),
+      metadata_json      TEXT NOT NULL,
+      partition_json     TEXT NOT NULL,
+      lane_state_json    TEXT NOT NULL,
+      io_descriptor_json TEXT NOT NULL,
+      secret_enc         BYTEA NOT NULL,
+      secret_nonce       BYTEA NOT NULL,
+      overall_hash_state TEXT,
+      created_at         BIGINT NOT NULL,
+      updated_at         BIGINT NOT NULL
+    )
+  `;
+  await sql`
+    CREATE INDEX IF NOT EXISTS shade_stream_state_peer_idx
+    ON shade_stream_state(peer_address)
+  `;
+  await sql`
+    CREATE INDEX IF NOT EXISTS shade_stream_state_updated_idx
+    ON shade_stream_state(updated_at)
+  `;
+  await sql`
+    CREATE INDEX IF NOT EXISTS shade_stream_state_status_idx
+    ON shade_stream_state(status, direction)
+  `;
 }
 
 export async function ensurePrekeyServerTables(sql: Sql): Promise<void> {

packages/shade-storage-postgres/src/postgres-storage.ts

@@ -1,5 +1,5 @@
 import postgres, { type Sql } from 'postgres';
-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,
@@ -200,4 +200,89 @@ export class PostgresStorage implements StorageProvider {
   async pruneRetiredIdentities(olderThan: number): Promise<void> {
     await this.sql`DELETE FROM shade_retired_identities WHERE retired_at < ${olderThan}`;
   }
+
+  // ─── Stream-transfer resume state (v0.2.0) ────────────────
+
+  async saveStreamState(state: PersistedStreamState): Promise<void> {
+    await this.sql`
+      INSERT INTO shade_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 (
+        ${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}
+      )
+      ON CONFLICT (stream_id) DO UPDATE SET
+        direction = EXCLUDED.direction,
+        peer_address = EXCLUDED.peer_address,
+        status = EXCLUDED.status,
+        metadata_json = EXCLUDED.metadata_json,
+        partition_json = EXCLUDED.partition_json,
+        lane_state_json = EXCLUDED.lane_state_json,
+        io_descriptor_json = EXCLUDED.io_descriptor_json,
+        secret_enc = EXCLUDED.secret_enc,
+        secret_nonce = EXCLUDED.secret_nonce,
+        overall_hash_state = EXCLUDED.overall_hash_state,
+        updated_at = EXCLUDED.updated_at
+    `;
+  }
+
+  async getStreamState(streamId: string): Promise<PersistedStreamState | null> {
+    const rows = await this.sql<Array<Record<string, unknown>>>`
+      SELECT * FROM shade_stream_state WHERE stream_id = ${streamId}
+    `;
+    if (rows.length === 0) return null;
+    return rowToStreamState(rows[0]!);
+  }
+
+  async removeStreamState(streamId: string): Promise<void> {
+    await this.sql`DELETE FROM shade_stream_state WHERE stream_id = ${streamId}`;
+  }
+
+  async listActiveStreamStates(direction?: 'send' | 'receive'): Promise<PersistedStreamState[]> {
+    const rows =
+      direction === undefined
+        ? await this.sql<Array<Record<string, unknown>>>`
+            SELECT * FROM shade_stream_state
+            WHERE status IN ('active','paused')
+            ORDER BY updated_at DESC
+          `
+        : await this.sql<Array<Record<string, unknown>>>`
+            SELECT * FROM shade_stream_state
+            WHERE status IN ('active','paused') AND direction = ${direction}
+            ORDER BY updated_at DESC
+          `;
+    return rows.map(rowToStreamState);
+  }
+
+  async pruneStreamStates(olderThan: number): Promise<void> {
+    await this.sql`
+      DELETE FROM shade_stream_state
+      WHERE status IN ('finished','aborted') AND updated_at < ${olderThan}
+    `;
+  }
+}
+
+function rowToStreamState(row: Record<string, unknown>): PersistedStreamState {
+  const out: PersistedStreamState = {
+    streamId: String(row.stream_id),
+    direction: row.direction as 'send' | 'receive',
+    peerAddress: String(row.peer_address),
+    status: row.status as 'active' | 'paused' | 'finished' | 'aborted',
+    metadataJson: String(row.metadata_json),
+    partitionJson: String(row.partition_json),
+    laneStateJson: String(row.lane_state_json),
+    ioDescriptorJson: String(row.io_descriptor_json),
+    secretEnc: row.secret_enc as Uint8Array,
+    secretNonce: row.secret_nonce as Uint8Array,
+    createdAt: Number(row.created_at),
+    updatedAt: Number(row.updated_at),
+  };
+  if (row.overall_hash_state !== null && row.overall_hash_state !== undefined) {
+    out.overallHashState = String(row.overall_hash_state);
+  }
+  return out;
 }