feat(connect-local): add Pi extension for local agent bridge

Monorepo Pi package with outbound WebSocket, pairing/reconnect flow,
presence reporting, and single-flight task.dispatch handling.

Co-authored-by: Cursor <cursoragent@cursor.com>

README.md

@@ -0,0 +1,32 @@
+# Connect Local Pi Extension
+
+Install with official Pi:
+
+```bash
+pi install git:git@github.com:your-org/agentic-chat-core.git#packages/connect-local
+```
+
+Prerequisite: [Pi coding agent](https://www.npmjs.com/package/@earendil-works/pi-coding-agent) installed globally or in your environment.
+
+## Commands
+
+- `/connect <pairing-token> [project-name]` — pair this interactive session with the cloud platform
+- `/disconnect` — close the bridge and clear stored reconnect credentials
+- `/connected` — show whether the bridge socket is connected
+
+Obtain a pairing token from Slack: `/pi local new`.
+
+## Configuration
+
+- `PI_PLATFORM_LOCAL_AGENT_WS_URL` — WebSocket URL (default `ws://127.0.0.1:3000/api/local-agent/ws`)
+- Reconnect credentials are stored under `~/.pi-platform/connect-local/` (outside your repo)
+
+## Development
+
+From monorepo root:
+
+```bash
+npm run build -w packages/shared
+npm run build -w packages/connect-local
+npm run test -w packages/connect-local
+```