feat(isac): author exotic talents in weapon editor

docs/DESIGN_SYSTEM.md

@@ -347,6 +347,12 @@ never a replacement for the family classification. Fixed base bonuses remain
 visually separate from tactical augmentation effects. Exotic definitions add a
 dedicated exotic-only talent after the two standard talent pools; their sixth
 augmentation cell communicates that this talent advances to Tier II.
+The exotic talent is owned by exactly one exotic weapon and is authored inline
+inside that weapon editor, never selected from a shared global pool. Its
+engineered sub-panel includes the talent name, shared description template,
+Tier I/II previews, reusable triggers, and paired effect values. The Talent
+Registry may display an owned exotic talent for discovery, but routes editing
+back to its weapon rather than opening the shared-talent editor.
 
 Large relationship sets use the searchable assignment control instead of
 checkbox walls. It keeps assigned records visible as removable chips, filters