phil d0d0bb35a4 Add fix command and troubleshooting for errno=16 error ...

- Add 'fix' command to diagnose CEC connection issues
- Add detailed troubleshooting section for common errors
- Fix handles errno=16 (device busy) by checking processes and trying sudo
- Document solutions for CEC permission and connection issues

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

2026-02-06 17:57:47 +01:00

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