Test Provenance Guard

Catches the failure mode where a new test file re-implements the function it claims to test, then asserts against its own copy. The tests pass. The CI is green. The tests provide zero regression protection.

This skill detects that pattern and, when invoked autonomously, fixes it without user intervention.

This SKILL.md is a thin index. Detailed procedures live in rules/*.md and load on demand. The case-study post-mortem and failure-mode taxonomy live in references/*.md.

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