New GET /knowledge/graph?type=&limit= returns the data the
curation UI's graph tab needs:
- nodes = entities with at least one in-scope fact (rejected /
superseded excluded). Carries fact_count for visual sizing.
Top-N by count desc; default cap 200 (clamped 1..1000).
- edges = relational facts (object_entity_id set) grouped by
(subject, object, predicate) so 3 "is_friend_of" facts
between the same pair collapse into one edge with count=3.
Two raw SQL queries: an INNER JOIN onto a persona-scoped fact-
count subquery for nodes (skips 0-fact entities entirely so the
sim doesn't waste time on disconnected islands), then a follow-
up GROUP BY over the persona-scoped fact set restricted to the
node id set via IN clauses (ids are i32 so inlining is safe).
Pairs with the Apollo-side GraphPanel that runs d3-force over
the returned payload and renders SVG with click-to-open.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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