On-demand LLM-driven wiki review — find contradictions between pages, stale claims, and missing concepts (topics mentioned in index.md / log.md / sources but not yet captured as their own page). Read-only — never modifies the wiki. Use when the user asks to "review the wiki", "find contradictions", "what's stale in the wiki", or "what's missing". Sister of mc-wiki-health-check (structural lint).
