feat: eager vLLM warmup and smart page titles in paginate stage

- Add warmup() to LlmProvider interface for eager subprocess startup
- ManagedVllmProvider.warmup() starts vLLM in background on project load
- ProviderRegistry.warmupAll() triggers all managed providers
- NamedProvider proxies warmup() to inner provider
- paginate stage generates LLM-powered descriptive page titles when
  available, cached by content hash, falls back to generic "Page N"
- project-mcp-endpoint calls warmupAll() on router creation so vLLM
  is loading while the session initializes

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

package.json

@@ -9,6 +9,7 @@
     "test": "vitest",
     "test:run": "vitest run",
     "test:coverage": "vitest run --coverage",
+    "test:smoke": "pnpm --filter mcplocal run test:smoke",
     "test:ui": "vitest --ui",
     "lint": "eslint 'src/*/src/**/*.ts'",
     "lint:fix": "eslint 'src/*/src/**/*.ts' --fix",