Add code-audit skill for systematic anti-pattern detection
Project-specific skill to audit codebase for:
- Error handling: silent failures, swallowed exceptions, hidden errors
- Security: missing auth, data exposure, injection risks
- Architecture: DI violations, import boundaries, coupling
Pattern definitions in YAML with verdict hints (ISSUE_IF/OK_IF) for
context-aware analysis. Tailored to Mantimon TCG architecture patterns
(core independence, stateless backend, repository pattern).
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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