release: v1.3.18

[GcsSloop]

Summary

• split tooling state endpoints by mode: /tooling/skills/state and /tooling/mcp/state
• make MCP page load mode-specific data only to avoid skill discovery/enrich blocking
• add live discovery refresh path for discovery modal and keep skills page local-first
• bump desktop/frontend version to 1.3.18

Verification

• go test ./internal/api ./internal/bootstrap
• npm test -- ToolingPage.test.tsx --run