First-Pass Corpus Quality Scan for reach-edu — a measured before/after baseline of the RAG corpus

Before wiring RAG/grounding over the reach-edu corpus, take a read-only baseline of what's actually there — 517 markdown files across 57 funder dirs (140 still in inbox). A fresh Claude Code session inventories, scores, and reports corpus quality so 'after' is comparable to 'before.' Diagnostic only — it changes nothing.