Fix create_entity_mentions to correctly count only newly created relationships,
not all relationships processed by MERGE.
**Problem**: count(r) was returning ALL relationships touched by MERGE (both
created and matched), breaking idempotency tests.
**Solution**: Use temporary flag 'just_created' set only ON CREATE, filter to
those relationships, count them, then remove the flag. This ensures the count
only includes new relationships.
Now properly returns:
- N on first run (N new relationships created)
- 0 on subsequent runs (no new relationships, all already exist)
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
jpmschweitzerandClaude Opus 4.5
65114cb477