feat: implement Rozenite as a built-in plugin (#29)

Closes #27

## Summary

Implements the Rozenite plugin on top of the generic plugin system from
#26. The plugin lets `agent-cdp` interoperate with Rozenite's React
Native agent tooling without leaking any Rozenite-specific details into
the core daemon or CLI.

### Rozenite plugin
- Lives entirely under `packages/agent-cdp/src/plugins/rozenite/*` —
core code is unaware of Fusebox globals, Rozenite domains, or tool
registry internals
- Activates only for React Native targets; fails cleanly on unsupported
targets
- On target selection, bootstraps a CDP bridge: calls `Runtime.enable`,
polls for `__FUSEBOX_REACT_DEVTOOLS_DISPATCHER__`, reads the dynamic
`BINDING_NAME`, registers it via `Runtime.addBinding`, initialises the
`rozenite` domain, and sends `agent-session-ready`
- Tools are discovered dynamically from `register-tool` /
`unregister-tool` binding events and held in an in-memory registry
- Tool calls are dispatched by evaluating
`__FUSEBOX_REACT_DEVTOOLS_DISPATCHER__.sendMessage` and correlated with
`tool-result` binding events via a `callId`
- Exposes a fixed CLI surface: `rozenite status`, `rozenite tools`,
`rozenite tool-schema <name>`, `rozenite call <name> [--input JSON]`

### Playground integration
- Adds `@rozenite/metro` (dev) and `@rozenite/agent-bridge` to the
playground
- `metro.config.js` wraps the Expo Metro config with `withRozenite`
(opt-in via `WITH_ROZENITE=true`)
- `useRozeniteBridge` hook registers three test tools (`app.echo`,
`app.getTimestamp`, `app.getPlaygroundInfo`) for end-to-end testing

## Testing

```sh
# start Metro with Rozenite enabled
cd playground && WITH_ROZENITE=true pnpm start

# run the app, then:
node packages/agent-cdp/dist/bin.js start
node packages/agent-cdp/dist/bin.js target list
node packages/agent-cdp/dist/bin.js target select <id>
node packages/agent-cdp/dist/bin.js rozenite status        # state: ready, toolCount: 3
node packages/agent-cdp/dist/bin.js rozenite tools
node packages/agent-cdp/dist/bin.js rozenite call app.echo --input '{"text":"hello"}'
```

---------

Co-authored-by: Szymon Chmal <szymon@chmal.it>

Author: burczu

packages/agent-cdp/skills/core.md

@@ -69,6 +69,12 @@ Requirements:
 Metro exposes multiple targets (JS runtime, Hermes debugger, etc.). Pick the
 one labelled with your app name or `"React Native"` in the target list.
 
+### Rozenite agent tools
+
+```bash
+agent-cdp skills get rozenite
+```
+
 ## Console capture
 
 ```bash
@@ -98,6 +104,14 @@ agent-cdp skills get network
 
 That skill contains session behavior, common workflows, body inspection guidance, and network-specific troubleshooting.
 
+## Rozenite
+
+For Rozenite in-app agent tools (`rozenite status|tools|call`), run:
+
+```bash
+agent-cdp skills get rozenite
+```
+
 ## Trace recording
 
 For trace workflows, run:

packages/agent-cdp/skills/rozenite.md

@@ -0,0 +1,35 @@
+---
+name: rozenite
+description: Rozenite in-app agent tools via agent-cdp. Use after core target selection. React Native via Metro/Fusebox; Chrome only with the Rozenite browser extension installed.
+allowed-tools: Bash(agent-cdp:*)
+---
+
+# agent-cdp rozenite
+
+Call tools registered in the app or page through the Rozenite CDP bridge.
+
+Prerequisite: `agent-cdp skills get core`, then `start` → `target list` → `target select`.
+
+## Targets
+
+- **React Native** — Metro debug target (`--url http://localhost:8081`). App must use **Rozenite**.
+- **Chrome** — CDP tab target (`--url http://localhost:9222`). Requires the **Rozenite browser extension**; without it bootstrap times out.
+
+Check readiness: `agent-cdp rozenite status` (works while bootstrapping).
+
+## Commands
+
+```bash
+agent-cdp rozenite status
+agent-cdp rozenite tools
+agent-cdp rozenite tool-schema <name>
+agent-cdp rozenite call <name> [--input '{"key":"value"}']
+```
+
+`status` returns `state` (`idle` | `waiting-for-runtime` | `ready` | `error` | `unsupported-target`), `toolCount`, and `target`. Other commands need `state: ready`.
+
+## Troubleshooting
+
+- **`waiting-for-runtime` / timeout** — Fusebox dispatcher missing: RN needs Rozenite in Metro; Chrome needs the extension on that tab.
+- **`toolCount: 0` but `ready`** — App has not registered tools yet; wait for `register-tool` events.
+- **Call hangs** — Tool handler not returning; default timeout 30s.