refactor: restructure add-gmail skill for new skill architecture

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.claude/skills/add-gmail/modify/container/agent-runner/src/index.ts.intent.md

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+# Intent: container/agent-runner/src/index.ts modifications
+
+## What changed
+Added Gmail MCP server to the agent's available tools so it can read and send emails.
+
+## Key sections
+
+### mcpServers (inside runQuery → query() call)
+- Added: `gmail` MCP server alongside the existing `nanoclaw` server:
+  ```
+  gmail: {
+    command: 'npx',
+    args: ['-y', '@gongrzhe/server-gmail-autoauth-mcp'],
+  },
+  ```
+
+### allowedTools (inside runQuery → query() call)
+- Added: `'mcp__gmail__*'` to allow all Gmail MCP tools
+
+## Invariants
+- The `nanoclaw` MCP server configuration is unchanged
+- All existing allowed tools are preserved
+- The query loop, IPC handling, MessageStream, and all other logic is untouched
+- Hooks (PreCompact, sanitize Bash) are unchanged
+- Output protocol (markers) is unchanged
+
+## Must-keep
+- The `nanoclaw` MCP server with its environment variables
+- All existing allowedTools entries
+- The hook system (PreCompact, PreToolUse sanitize)
+- The IPC input/close sentinel handling
+- The MessageStream class and query loop