055e2ecdc7
Bump version to 0.9.2 across all references. Add release notes, demo verification script, and doc updates. Key highlights: - Dispatcher: clean up leaked tasks/pages on streaming crawl close (#2071) - Docker: fix Playground Advanced Config 400 (#2059) and Monitor WebSocket 500 (#2060) - Docker: include Playwright headless shell (#2067) - GPU: fix ENABLE_GPU=true builds via CUDA toolkit non-free apt source (#2020)