This skill should be used when the user says "review implementation", "review the project", "check implementation", "quality review", "validate implementation", "implementation review", or wants a post-execution quality gate to verify that the implementation follows the project's stored code and testing patterns and matches the plan. Reports issues as ERRORS, WARNINGS, INFO with a verdict. Do NOT use this for reviewing PRs (use arn-code-review-pr) or validating plans (use arn-code-review-plan).