v0.4.0

What's Changed

• Harden the action: major-scoped version resolution + CI smoke-test by @0xLeif in #28
• Add: ubuntu-latest to the action smoke-test matrix by @0xLeif in #27
• Fix: fail loudly on bad policy, confidence, and revision input; history-ordered log by @0xLeif in #29

Full Changelog: v0.3.2...v0.4.0