Fix container execution and add debug tooling

Container fixes:
- Run as non-root 'node' user (required for --dangerously-skip-permissions)
- Add allowDangerouslySkipPermissions: true to SDK options
- Mount .env file to work around Apple Container -i env var bug
- Use --mount for readonly, -v for read-write (Apple Container quirk)
- Bump SDK to 0.2.29, zod to v4
- Install Claude Code CLI globally in container

Logging improvements:
- Write per-run logs to groups/{folder}/logs/container-*.log
- Add debug-level logging for mounts and container args

Documentation:
- Add /debug skill with comprehensive troubleshooting guide
- Update /setup skill with API key configuration step
- Update SPEC.md with container details, mount syntax, security notes

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

container/agent-runner/package.json

@@ -9,8 +9,8 @@
     "start": "node dist/index.js"
   },
   "dependencies": {
-    "@anthropic-ai/claude-agent-sdk": "^0.1.9",
-    "zod": "^3.24.2"
+    "@anthropic-ai/claude-agent-sdk": "0.2.29",
+    "zod": "^4.0.0"
   },
   "devDependencies": {
     "@types/node": "^22.10.7",