Skill: Validate Document Artifacts

Purpose

Check that documents under docs/ conform to the project's artifact norms (or default spec/artifact-contract.md). Emit a findings list for path, naming, and front-matter violations so users can remediate.

Core Objective

Primary Goal: Produce a findings list of documents that violate artifact norms, with Location, Severity, Title, Description, and Suggestion for each finding.

Success Criteria (ALL must be met):

1. ✅ Norms resolved: Project norms read from docs/ARTIFACT_NORMS.md or .ai-cortex/artifact-norms.yaml; fallback to spec/artifact-contract.md
2. ✅ Docs scanned: All relevant Markdown under docs/ (or specified scope) enumerated
3. ✅ Artifact type inferred: Per file, inferred from path pattern or front-matter artifact_type
4. ✅ Compliance checked: Path, naming, front-matter validated against norms
5. ✅ Findings emitted: Each violation as a finding with Location, Category, Severity, Title, Description, Suggestion