Fix MinioStorage.upload_file → .upload + suppress instant delivery during eSign pause

- upload_file doesn't exist on MinioStorage — the method is upload()
- Return [] when pausing for eSign so job_server doesn't trigger instant delivery

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

scripts/workers/services/cpni_certification.py

@@ -201,7 +201,7 @@ class CPNIFilingHandler(BaseServiceHandler):
                 if path.endswith(".pdf") and "certification" in path.lower():
                     remote = f"compliance/{order_number}/{os.path.basename(path)}"
                     try:
-                        storage.upload_file(path, remote)
+                        storage.upload(path, remote)
                         pdf_minio_key = remote
                     except Exception as exc:
                         logger.warning("MinIO upload failed for %s: %s", path, exc)
@@ -229,7 +229,7 @@ class CPNIFilingHandler(BaseServiceHandler):
                 logger.warning("Could not create CPNI eSign record: %s", exc)
 
             logger.info("CPNIFilingHandler: paused for client eSign — order %s", order_number)
-            return generated
+            return []  # Don't return files — prevents instant delivery before signing
 
         # ── 2b. Auto-filing toggle ──────────────────────────────────────
         decision = check_auto_filing(order_data)