Bundles the merged work from:
- #4 feat: complete v0.2 — SA suite 0 failures, mypy clean, CI tightened
- #5 fix(v0.2.1): 14 review bugs + adversarial torture suite
- #6 chore(release): bump version to 0.2.0
- #7 chore: bump Development Status classifier 3 - Alpha → 4 - Beta