feat: implement CookieBridge M1 — core protocol & relay server

- Protocol spec: encrypted envelope format, device identity (Ed25519 + X25519),
  LWW conflict resolution with Lamport clocks
- E2E encryption: XChaCha20-Poly1305 via sodium-native, X25519 key exchange
- WebSocket relay server: stateless message forwarding, device auth via
  challenge-response, offline message queuing, ping/pong keepalive
- Device pairing: time-limited pairing codes, key exchange broker via HTTP
- Sync protocol: envelope builder/opener, conflict-resolving cookie store
- 31 tests passing (crypto, pairing, conflict resolution, full integration)

Co-Authored-By: Paperclip <noreply@paperclip.ing>

projects/cookiebridge/tsconfig.json

@@ -0,0 +1,18 @@
+{
+  "compilerOptions": {
+    "target": "ES2022",
+    "module": "Node16",
+    "moduleResolution": "Node16",
+    "outDir": "dist",
+    "rootDir": "src",
+    "strict": true,
+    "esModuleInterop": true,
+    "skipLibCheck": true,
+    "forceConsistentCasingInFileNames": true,
+    "declaration": true,
+    "declarationMap": true,
+    "sourceMap": true
+  },
+  "include": ["src/**/*"],
+  "exclude": ["node_modules", "dist", "tests"]
+}