Six bugs this project shipped into a branch, what let each through, and the
guard that now catches it. They share a shape: the test passed, and the test
was wrong.
- a regression test that constructed its own correct object, so reverting the
bug left the suite green
- GDScript default params turning an arity change into a silent miscompile,
invisible to a grep for the renamed field (grep cannot see positional args)
- a determinism test comparing two runs that would change together
- a closed move vocabulary that was not bounded, because the model could repeat
a tag and choose an amount in unary
- a roster written down in four places with only one pair guarded — including a
shipped authoring skill that would have emitted origins allowing zero callings
- generated content that has a client consumer
Linked from CLAUDE.md §18 and docs/README.md. Also records M4-a on the roadmap
with its live end-to-end proof.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01QYa9u7Kdxv5gX4AnwWexy8
