fix: Pass 0b INSERT ON CONFLICT DO UPDATE + per-result commit/rollback

Prevents UniqueViolation from blocking entire batch. Each result
is committed individually, errors are rolled back without affecting
subsequent results.

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

control-pipeline/services/decomposition_pass.py

@@ -3314,6 +3314,11 @@ class DecompositionPass:
                     CAST(:framework_id AS uuid),
                     'pass0b', 2
                 )
+                ON CONFLICT (framework_id, control_id) DO UPDATE
+                SET title = EXCLUDED.title,
+                    objective = EXCLUDED.objective,
+                    requirements = EXCLUDED.requirements,
+                    updated_at = NOW()
                 RETURNING id::text
             """),
             {
@@ -3686,11 +3691,19 @@ class DecompositionPass:
                     self._handle_batch_result_0a(custom_id, text_content, stats)
                 else:
                     await self._handle_batch_result_0b(custom_id, text_content, stats)
+                self.db.commit()
             except Exception as e:
                 logger.error("Processing batch result %s: %s", custom_id, e)
                 stats["errors"] += 1
+                try:
+                    self.db.rollback()
+                except Exception:
+                    pass
 
-        self.db.commit()
+        try:
+            self.db.commit()
+        except Exception:
+            pass
         stats["status"] = "completed"
         return stats