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>

scripts/build-rpm.sh

@@ -13,6 +13,10 @@ fi
 # Ensure tools are on PATH
 export PATH="$HOME/.npm-global/bin:$HOME/.bun/bin:$HOME/.local/bin:$PATH"
 
+echo "==> Running unit tests..."
+pnpm test:run
+echo ""
+
 echo "==> Building TypeScript..."
 pnpm build