The tab list from Playwright MCP uses '- N: (current) [title](url)' format,
but extractTabEntries only matched 'Tab N ...' format. This caused
_initialTabIdentities to always be empty, so tabs were never cleaned up.
Now supports both formats.
- Add isCdpApiAvailable() to verify CDP HTTP JSON API before using endpoint
- Chrome's chrome://inspect#remote-debugging writes DevToolsActivePort but
its CDP endpoint is incompatible with Playwright connectOverCDP (init
succeeds but all tool calls hang silently)
- Add CDP readiness probe in connect() to catch unresponsive endpoints
- Skip tab cleanup in close() for CDP mode (no bridge tabs to clean)
- Add PlaywrightMCPMode tracking for extension vs CDP lifecycle policy
jackwener