v1.7.3

What's Changed

• Coverage: 94.55% → 98.72% statements (+15 tests, 189→204)
• 100% functions covered across all source files
• Pipeline: allowlist catch, mid-flight gate, L6 headers, nonJsonBody path
• Engine: debug mode logging (addScore, handleRedisError, circuit breaker), onViolation hook, use() method
• Validator: non-ZodError path (refine throws)
• Docs: README coverage badge updated to 99%