feat: MCP server foundation with full tool surface and auto-registration
- 14 MCP tools: vault CRUD, search, list, context, link, frontmatter edit, and 4 UI actions
- Auto-registers Laputa in ~/.claude/mcp.json and ~/.cursor/mcp.json on startup
- WebSocket bridge spawned on app start (port 9710 tools, 9711 UI actions)
- Frontend useMcpRegistration hook for vault-aware registration
- Comprehensive tests: 26 vault.js tests covering all 9 exported functions
- Added gray-matter dependency for frontmatter parsing
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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