Andy Lee 439debbd3f fix: add extensive logging and fix subprocess PIPE blocking ...

1. CI Logging Enhancements:
   - Added comprehensive diagnostics with process tree, network listeners, file descriptors
   - Added timestamps at every stage (before/during/after pytest)
   - Added trap EXIT to always show diagnostics
   - Added immediate process checks after pytest finishes
   - Added sub-shell execution with immediate cleanup

2. Fixed Subprocess PIPE Blocking:
   - Changed Colab mode from PIPE to DEVNULL to prevent blocking
   - PIPE without reading can cause parent process to wait indefinitely

3. Pytest Session Hooks:
   - Added pytest_sessionstart to log initial state
   - Added pytest_sessionfinish for aggressive cleanup before exit
   - Shows all child processes and their status

This should reveal exactly where the hang is happening.

2025-08-08 18:55:50 -07:00

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