v2 phase 4+5: Discord via Chat SDK, expanded MCP tools, message seq IDs

- Chat SDK bridge + Discord adapter (gateway listener, message routing)
- MCP tools refactored into modular structure: core (send_message, send_file,
  edit_message, add_reaction), scheduling (schedule/list/cancel/pause/resume
  tasks), interactive (ask_user_question, send_card), agents (send_to_agent)
- Message seq IDs: shared integer sequence across messages_in/out so agents
  see small numeric IDs instead of platform snowflakes
- busy_timeout=5000 for session DB (poll loop + MCP server concurrent access)
- Always copy agent-runner source to fix stale cache when non-index files change
- Seed script for Discord testing, e2e test script

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

package.json

@@ -21,8 +21,11 @@
     "test:watch": "vitest"
   },
   "dependencies": {
+    "@chat-adapter/discord": "^4.24.0",
+    "@chat-adapter/state-memory": "^4.24.0",
     "@onecli-sh/sdk": "^0.2.0",
     "better-sqlite3": "11.10.0",
+    "chat": "^4.24.0",
     "cron-parser": "5.5.0"
   },
   "devDependencies": {