feat: generate resolution outputs on session resolve

Integrates ResolutionOutputGenerator into the resolve endpoint so that
structured outputs (ticket note, KB article, etc.) are auto-generated
after every successful session resolution. Non-blocking — resolve still
succeeds if output generation fails.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

backend/app/api/endpoints/ai_sessions.py

@@ -416,6 +416,15 @@ async def resolve_session(
     except PermissionError as e:
         raise HTTPException(status_code=status.HTTP_403_FORBIDDEN, detail=str(e))
 
+    # Generate resolution outputs (branching feature)
+    try:
+        from app.services.resolution_output_generator import ResolutionOutputGenerator
+        gen = ResolutionOutputGenerator(db)
+        await gen.generate_all(session_id)
+    except Exception:
+        logger.exception(f"Failed to generate resolution outputs for session {session_id}")
+        # Non-blocking — resolve still succeeds even if output generation fails
+
     await db.commit()
     return result