Documentation Sync Checker Skill

Deterministic 4-phase drift detector that compares the filesystem against README entries. Each phase (Scan, Cross-Reference, Detect, Report) has a gate that must pass before proceeding. The skill produces a sync score (percentage of tools properly documented) and actionable fix suggestions for every detected issue.

This skill checks documentation presence and absence only -- it does not judge description quality, generate documentation content, resolve merge conflicts, validate cross-references, or track when drift occurred. Suggested fixes use YAML descriptions verbatim; content generation and quality assessment require different skills.

Optional flags: --auto-fix (experimental, requires explicit opt-in), --strict (exit code 1 on issues), --format json (machine-readable output for CI/CD).

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