fix(pi): add snap node compatibility diagnostics and documentation

- Added detailed error logging to detect snap node compatibility issues
- When Pi process exits with code 1, log helpful diagnostic info including node path
- Add hint to check for snap node and reinstall via apt/nvm
- Create SNAP_NODE_COMPATIBILITY.md with full troubleshooting guide
- Document root cause: snap node has file descriptor incompatibility with Bun.spawn stdin pipes
- Provide clear installation instructions for NodeSource and nvm alternatives

package.json

@@ -26,7 +26,11 @@
     "format": "{ git diff --name-only HEAD -- 'src/**/*.ts' 'src/**/*.tsx'; git ls-files --others --exclude-standard -- 'src/**/*.ts' 'src/**/*.tsx'; } | xargs -r prettier --write",
     "format:all": "prettier --write \"src/**/*.{ts,tsx}\"",
     "format:check": "prettier --check \"src/**/*.{ts,tsx}\"",
-    "setup": "bash scripts/setup.sh"
+    "setup": "bash scripts/setup.sh",
+    "start:sidecar": "sudo systemctl start officer-pty-sidecar",
+    "stop:sidecar": "sudo systemctl stop officer-pty-sidecar",
+    "restart:sidecar": "sudo systemctl restart officer-pty-sidecar",
+    "logs:sidecar": "journalctl -u officer-pty-sidecar -f"
   },
   "dependencies": {
     "@anthropic-ai/claude-agent-sdk": "^0.2.41",