fix: register setup command + remove remaining xcrun/adb (GH #28 review)

Multi-review consensus fixes:
- Register rn-setup skill + setup command in plugin.json so
  /rn-dev-agent:setup actually works (was a dead reference)
- Replace xcrun simctl screenshot + adb screencap in Step 1 and
  Phase 8 with device_screenshot MCP tool (GATE contradiction)
- Classify agent-device as critical in setup skill
- Handle nvm not installed in Node.js check (suggest brew/fnm/download)
- Use 2>&1 instead of 2>/dev/null for visible install diagnostics

Author: Lykhoyda

.claude-plugin/plugin.json

@@ -24,7 +24,8 @@
     "./skills/rn-device-control",
     "./skills/rn-testing",
     "./skills/rn-debugging",
-    "./skills/rn-best-practices"
+    "./skills/rn-best-practices",
+    "./skills/rn-setup"
   ],
   "agents": [
     "./agents/rn-tester.md",
@@ -45,7 +46,8 @@
     "./commands/rn-agent-import.md",
     "./commands/rn-agent-health.md",
     "./commands/nav-graph.md",
-    "./commands/send-feedback.md"
+    "./commands/send-feedback.md",
+    "./commands/setup.md"
   ],
   "userConfig": {
     "RN_METRO_PORT": {

commands/rn-feature-dev.md

@@ -220,11 +220,8 @@ cdp_error_log(clear=true)
 ```
 
 Then capture the current screen state:
-```bash
-# iOS
-xcrun simctl io booted screenshot --type=jpeg /tmp/rn-feature-verify.jpg
-# Android
-adb exec-out screencap -p > /tmp/rn-feature-verify.png
+```
+device_screenshot(path="/tmp/rn-feature-verify.jpg")
 ```
 
 ### Step 2: Health Check
@@ -452,11 +449,8 @@ in the table, execute in order:
    - Wait 1-2 seconds for state to settle (or use `device_snapshot` to confirm)
 
 2. **Capture the screenshot** using the exact filename from the table:
-   ```bash
-   # iOS
-   xcrun simctl io booted screenshot --type=jpeg docs/proof/<feature-slug>/<filename>
-   # Android
-   adb exec-out screencap -p > docs/proof/<feature-slug>/<filename>
+   ```
+   device_screenshot(path="docs/proof/<feature-slug>/<filename>")
    ```
 
 3. **Verify the expected state** as specified in the table:

commands/setup.md

@@ -0,0 +1,7 @@
+---
+command: setup
+description: Check and install all rn-dev-agent prerequisites. Run on first setup or when tools fail.
+argument-hint: 
+---
+
+Run the environment setup checklist from the `rn-setup` skill. Check all 9 prerequisites (Node.js, CDP bridge, agent-device, maestro-runner, simulators, Metro, CDP connection, ffmpeg) and install any missing dependencies. Present results as a table.

skills/rn-setup/SKILL.md

@@ -23,10 +23,10 @@ This skill checks every prerequisite and installs missing dependencies.
 node --version
 ```
 **Required:** Node.js >= 22 LTS (even-numbered release).
-If odd-numbered (e.g., v25) or < 22: warn the user to install Node 22 via nvm.
-```bash
-nvm install 22 && nvm use 22
-```
+If odd-numbered (e.g., v25) or < 22: warn the user to install Node 22.
+- If `nvm` is installed (`command -v nvm`): `nvm install 22 && nvm use 22`
+- If `fnm` is installed: `fnm install 22 && fnm use 22`
+- Otherwise: download from https://nodejs.org/en/download/ or `brew install node@22`
 
 ### 2. CDP bridge dependencies
 ```bash
@@ -95,8 +95,8 @@ Present results as a table:
 | CDP connection | CONNECTED | — |
 | ffmpeg | OK (v7.1) | — |
 
-If any critical check fails (CDP bridge, Metro, or simulator), provide
-step-by-step instructions to fix it. Do not proceed with feature
+If any critical check fails (CDP bridge, agent-device, Metro, or simulator),
+provide step-by-step instructions to fix it. Do not proceed with feature
 development until all critical checks pass.
 
 ## After setup