Records the now-complete corpus citation graph: why native not Obsidian (G2),
the 6 opt-in node layers (precedent/topic/practice-area · halacha · gaps ·
digests), node size/color semantics, the Graph Analysis metrics
(PageRank/betweenness/community via web/graph_metrics.py), navigation, the
/api/graph/* endpoints, the key files, a how-to-extend recipe, the invariants
(G2/G5/UI2/UI4), and the PR history.
Adds docs/corpus-graph.md + a reference-table row in legal-ai/CLAUDE.md.
Docs only — no code change.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
