fix(batch-dedup): don't crash on FK violation in _write_review

Stale UUIDs in the Qdrant dedup collection can reference controls
that were deprecated in earlier batches. Log warning and continue
instead of raising and killing the entire job.

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

control-pipeline/services/batch_dedup_runner.py

@@ -606,9 +606,9 @@ class BatchDedupRunner:
             })
             self.db.commit()
         except Exception as e:
-            logger.error("BatchDedup _write_review error: %s", e)
+            logger.warning("BatchDedup _write_review skipped (FK or other error): %s", e)
             self.db.rollback()
-            raise
+            self.stats["errors"] += 1
 
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