Post-promotion amendment captured in:
- claude-skills#tdd-criteria-skill-write description (b7819b17 in claude-skills)
- claude-skills#tdd-criteria-precommit-hook (new task d440bb52 in claude-skills)
- meeting-room .wiki/log.md amended-line
User surfaced second-order vandalism: agent rewrites failing test instead
of fixing code. Defence: tests are append-only; modification requires
[test-modify: <name>: was <literal>; is <literal>; reason: <Z>] in commit
subject + separate commit from impl changes. Rule 4 added to runtime
SKILL.md when impl-task runs; design-doc amendment text embedded in
task description for same impl session (knowledge_ingest is create-only,
overwrite blocked, so design-doc patch goes via direct git edit during impl).
vitya
78444f9ef3