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-recovery/src/index.ts

@@ -0,0 +1,77 @@
+/**
+ * `@shade/recovery` — social key recovery for Shade (V3.10).
+ *
+ * Public surface:
+ *  - {@link setupRecovery}: distribute Shamir shares to guardians.
+ *  - {@link attachGuardian}: wire a guardian-side receiver.
+ *  - {@link requestRecovery}: rebuild a lost identity from threshold guardians.
+ *  - {@link splitSecret} / {@link combineShares}: low-level Shamir primitives
+ *    (exported for advanced callers and test harnesses).
+ *  - Errors, store interface, and protocol envelope types.
+ */
+
+// Core flows
+export { setupRecovery } from './setup.js';
+export type {
+  SetupRecoveryOptions,
+  SetupRecoveryResult,
+  GuardianDelivery,
+  RecoveryDeliver,
+} from './setup.js';
+
+export { attachGuardian } from './guardian.js';
+export type {
+  AttachGuardianOptions,
+  AttachedGuardian,
+  GuardianApproveContext,
+  GuardianApproveHandler,
+} from './guardian.js';
+
+export { requestRecovery } from './request.js';
+export type {
+  RequestRecoveryOptions,
+  RecoveryProgress,
+  RecoveryResult,
+} from './request.js';
+
+// Storage
+export { MemoryRecoveryStore } from './store.js';
+export type { GuardianShareEntry, RecoveryStore } from './store.js';
+
+// Errors
+export {
+  RecoveryError,
+  RecoveryDeclinedError,
+  RecoveryGuardianRejectedError,
+  RecoveryProtocolError,
+  RecoveryReconstructionError,
+  RecoveryTimeoutError,
+} from './errors.js';
+
+// Protocol — exported for apps that need to inspect or relay envelopes.
+export {
+  encodeRecoveryEnvelope,
+  tryParseRecoveryEnvelope,
+  RECOVERY_DISCRIMINATOR,
+  RECOVERY_PROTOCOL_VERSION,
+} from './protocol.js';
+export type {
+  RecoveryEnvelope,
+  RecoveryMessageType,
+  RecoveryRequestEnvelope,
+  ShareDeclineEnvelope,
+  ShareDepositEnvelope,
+  ShareGrantEnvelope,
+} from './protocol.js';
+
+// Shamir primitives — exported for tests and advanced callers (e.g.
+// hardware-token integrations that want to split a different secret).
+export { splitSecret, combineShares, encodeShare, decodeShare } from './shamir.js';
+export type { ShamirShare } from './shamir.js';
+
+// Encoding helpers — used by widget-layer code and integration tests.
+export {
+  bytesToBase64Url,
+  base64UrlToBytes,
+  recoveryKeyToBackupPassphrase,
+} from './encoding.js';