fix: tighten governance regex coverage

[CoderDeltaLAN]

Summary

• Tighten unsafe-command governance detection for natural use sudo ... wording.
• Replace the typo-prone override authority pattern with explicit override verb forms.
• Add focused governance tests for sudo order and override/overrode/overridden/overriding authority-scope variants.

Verification

• PYTHONPATH=src python -m unittest tests.test_governance -v
• ./scripts/check.sh
• workflow_dispatch CI on branch: 27621368953