release(v4.0.0): Shade GA — V3.x consolidation + audit prep

V3.1 → V3.12 consolidated and tagged for the first GA release. Wire
format unchanged from 0.4.x — 4.0 peers interoperate with 0.4.x peers
byte-for-byte. The version bump is semantic: audit-cycle complete,
opt-in surface fully exposed, threat model refreshed for every new
surface.

Highlights:
- All 24 @shade/* packages bumped to 4.0.0 in lockstep.
- CHANGELOG 4.0.0 section is the canonical manifest of what landed.
- THREAT-MODEL extended (§10 fingerprint gates, §11 WebRTC P2P, §12
  Web-Worker boundary) + residual-risks table refreshed.
- OpenAPI now covers all 27 routes: prekey, transfer, KT, inbox,
  bridge, observer, /metrics, /healthz, /ready.
- MIGRATION 0.3.x → 4.0 documented + smoke-tested against
  shade migrate-storage on a real SQLite DB.
- docs/audit/REVIEW-BUNDLE.md + SCOPE.md ready for external reviewer.
- scripts/soak.ts harness for the GA-stable 2-week soak window.
- All V*.md plans archived under docs/archive/ with Status: Done.
- Voice/Video carved out into V5.0; 4.0 audit focuses on the frozen
  non-realtime stack.

Tests: TS 1000/1000 + Kotlin 11/11 cross-platform vectors green.
Docker: gt.zyon.no/stian/shade-prekey:4.0.0 builds and reports
  version 4.0.0 on /health.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

packages/shade-sdk/src/index.ts

@@ -1,14 +1,33 @@
 export { createShade } from './create-shade.js';
 export { Shade } from './shade.js';
+export type {
+  ShadeUploadOptions,
+  ShadeWebRtcConfig,
+  ShadeWebRtcRuntime,
+} from './shade.js';
+export { generateThumbnail } from './thumbnail.js';
+export type { GeneratedThumbnail, ThumbnailGenerationOptions } from './thumbnail.js';
+export { ShadeThumbnailCache } from './thumbnail-cache.js';
+export type { ThumbnailHit } from './thumbnail-cache.js';
 export { resolveConfig, parseRotationInterval } from './config.js';
 export { BackgroundTasks } from './background.js';
 export {
   exportBackup,
   importBackup,
+  decryptBackup,
+  applyBackupPayload,
   backupToString,
   backupFromString,
 } from './backup.js';
-export type { ShadeConfig, ResolvedConfig } from './config.js';
+export {
+  FingerprintGateRegistry,
+} from './gates.js';
+export type {
+  FingerprintGate,
+  FingerprintGateContext,
+  FingerprintGateHandler,
+} from './gates.js';
+export type { ShadeConfig, ResolvedConfig, ShadeKTConfig, ResolvedKTConfig } from './config.js';
 export type { BackgroundHooks } from './background.js';
 export type { BackupBlob, BackupPayload } from './backup.js';
 
@@ -25,6 +44,7 @@ export {
   MemoryControlChannel,
   MemoryTransferTransport,
   ShadeTransferHttpTransport,
+  MultiTransportFallback,
   createTransferRoutes,
   PermissiveAuthenticator,
   TransferError,
@@ -34,6 +54,7 @@ export {
   TransferOfflineError,
   TransferResumeError,
 } from '@shade/transfer';
+export type { NamedTransport } from '@shade/transfer';
 export type {
   TransferOptions,
   TransferProgress,
@@ -54,4 +75,37 @@ export type {
   TransferResumeState,
   LaneProgress,
 } from '@shade/transfer';
-export type { StreamMetadata, LaneInitSpec, LanePartition } from '@shade/streams';
+export type {
+  StreamMetadata,
+  StreamFileMetadata,
+  ThumbnailMime,
+  LaneInitSpec,
+  LanePartition,
+} from '@shade/streams';
+export {
+  THUMBNAIL_MAX_BYTES,
+  THUMBNAIL_MIME_ALLOWLIST,
+  isAllowedThumbnailMime,
+  validateFileMetadata,
+  declaresThumbnail,
+  thumbnailStreamIdFor,
+  mainStreamIdForThumbnail,
+} from '@shade/streams';
+
+// ─── Web Workers crypto (V3.8) ─────────────────────────────
+export {
+  createWorkerCryptoProvider,
+  WorkerCryptoProvider,
+  WorkerStreamSender,
+  WorkerStreamReceiver,
+  createEncryptStream,
+  createDecryptStream,
+  DEFAULT_STREAM_CHUNK_SIZE,
+  WORKER_PROTOCOL_VERSION,
+} from '@shade/crypto-web';
+export type {
+  WorkerCryptoProviderOptions,
+  WorkerLike,
+  CreateEncryptStreamOptions,
+  CreateDecryptStreamOptions,
+} from '@shade/crypto-web';