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ed65f2c21c
When a PR is force-pushed, github.event.before points to an orphaned commit that isn't fetched by actions/checkout. This caused the workflow to fail with "Error: command not found" (exit code 127) because: 1. pr_analyzer.py's git diff failed on the inaccessible commit 2. Error messages went to stdout, breaking the source command This fix: - Validates COMPARE_BASE accessibility before use via git cat-file - Falls back to merge-base strategy if commit is orphaned - Sends error messages to stderr for defensive error handling 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
