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-inbox/src/events.ts

@@ -0,0 +1,72 @@
+/**
+ * Client-side inbox event emitter.
+ *
+ * The high-level `Inbox` orchestrator emits structural events — message
+ * queued, delivered, polled, decrypted — so apps can drive UI badges,
+ * push hooks, or telemetry without polling internal state.
+ */
+
+export interface InboxClientEventMap {
+  /**
+   * A new ciphertext entry was added to the outgoing queue. The push-hook
+   * mentioned in the V3.6 spec dispatches off this event.
+   */
+  'inbox.message_queued': {
+    recipientAddress: string;
+    msgId: string;
+    bytes: number;
+    ttlSeconds: number;
+  };
+  /** Server confirmed a queued blob landed. */
+  'inbox.message_delivered': {
+    recipientAddress: string;
+    msgId: string;
+    idempotent: boolean;
+  };
+  /** Delivery attempt failed; will retry on next flush. */
+  'inbox.message_failed': {
+    recipientAddress: string;
+    msgId: string;
+    attempts: number;
+    error: string;
+  };
+  /** A poll cycle completed and pulled `count` blobs. */
+  'inbox.poll_completed': { ownAddress: string; count: number; cursor: number };
+  /** Caller successfully decrypted and acked a blob. */
+  'inbox.message_received': {
+    senderHint: string | null;
+    msgId: string;
+  };
+  /** Caller failed to decrypt — typically tampering or stale ratchet. */
+  'inbox.message_decrypt_failed': {
+    msgId: string;
+    error: string;
+  };
+}
+
+export type InboxClientEventName = keyof InboxClientEventMap;
+export type InboxClientEvent = {
+  [K in InboxClientEventName]: { name: K; data: InboxClientEventMap[K]; timestamp: number };
+}[InboxClientEventName];
+
+export type InboxClientListener = (e: InboxClientEvent) => void;
+
+export class InboxClientEvents {
+  private readonly listeners = new Set<InboxClientListener>();
+
+  on(listener: InboxClientListener): () => void {
+    this.listeners.add(listener);
+    return () => this.listeners.delete(listener);
+  }
+
+  emit<K extends InboxClientEventName>(name: K, data: InboxClientEventMap[K]): void {
+    const event = { name, data, timestamp: Date.now() } as InboxClientEvent;
+    for (const l of this.listeners) {
+      try {
+        l(event);
+      } catch (err) {
+        console.error('[Shade] Inbox client listener threw:', err);
+      }
+    }
+  }
+}