Jared Vititoe f7ed682bdb Standardize error handling with cleanup trap ...

- Add cleanup function called on EXIT trap
- Add ERRORS_OCCURRED and WARNINGS_OCCURRED counters
- Make handle_error support non-fatal errors with optional parameter
- Add proper exit codes for INT (130) and TERM (143) signals
- Add summary of errors/warnings at the end of diagnostics
- Redirect error messages to stderr

#10

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

2026-02-05 10:50:14 -05:00

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