we (web engine): Experimental web browser project to understand the limits of Claude

Review fixes: clean up comments, fix test names, add arrow tests, guard throw_into_generator master

- Remove stream-of-consciousness comments in async_resume_callback, replace with concise doc explaining the actual mechanism - Rename misleading test_async_arrow_* tests to test_async_function_expression* (they tested function expressions, not arrows) - Add real async arrow function tests using `async x => ...` syntax - Add Executing state guard to throw_into_generator for consistency with run_generator (prevents re-entrancy) Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>


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