Adds a new `audit_test_quality` step between `scan_antipatterns` and
`identify_human_verification` that catches test-level deceptions:
- Disabled tests (it.skip/xit/test.todo) covering phase requirements
- Circular tests (system generating its own expected values)
- Weak assertions (existence-only when value-level proof needed)
- Expected value provenance tracking for parity/migration phases
Any blocker from this audit forces `gaps_found` status, preventing
phases from being marked complete with inadequate test evidence.
Fixes#1457
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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