- Consolidated AI provider imports through register-builtins and moved Gemini/Antigravity header helpers to a shared module.
- Added lazy loading for heavy providers and SDK-backed modules with cached initialization to trim startup cost.
- Converted markdown conversion helpers to async and awaited htmlToBasicMarkdown in affected scraper and kernel output paths.
- Parsed bundled agent definitions on-demand and moved BrowserTool prompt rendering behind a memoized getter.
- Added cached validation/error handling paths by replacing AJV runtime checks with Value.Check and trimming validation error output.
- Removed legacy actions and reworked tool schema to open/run/close with required open-before-run async-JS flow.
- Added named tab reuse with browser-kind checks and close options all/kill with ref-counted disposal.
- Implemented launch/CDP hardening by finding free ports, reusing live targets, waiting for readiness, and killing process trees.
- Added readable result extraction, selector and action visibility checks, and screenshot/observation support in run execution.
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