S00-004: Record blocked task and remediation handoff

Changes: Preserve incomplete work and blocker metadata for S00-004. This checkpoint does not mark implementation accepted.
Validation: Session ended with status blocked.
Blocker: Agent timed out; process terminated before escalation

Task: S00-004
Agent: auto-crypto-8bf3dcf711b9
Role: crypto
Action: claim
Status: blocked

Task title: Проверить browser OMEMO backend

experiments/0003-crypto-library/package.json

@@ -0,0 +1,11 @@
+{
+  "name": "0003-crypto-library",
+  "private": true,
+  "type": "module",
+  "engines": {
+    "node": ">=24.20.0"
+  },
+  "dependencies": {
+    "@signalapp/libsignal-client": "0.105.0"
+  }
+}