GET /knowledge/entities/{id} now flags facts as `in_conflict` when
another active fact shares the same predicate but disagrees on the
object (entity id or text value). Pure read-time computation in the
handler — group facts by predicate, distinct-object count > 1 flags
all members. No schema change; same shape as `is_current` on photo
insights.
The flag is intentionally a *signal*, not a hard constraint. Some
predicates are legitimately multi-valued (friend_of, tagged_in,
appears_in) — the curator UI surfaces the amber accent and lets the
user reject the stale fact, accept both, or supersede one later
once the supersession column lands.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
bcd5312953