gapfill G1: remove 5 ruff F401 unused imports (3 unused os in production files, 2 in tests); no assert lines changed, ruff all cloud now 0

cloud/arch_conformance.py

@@ -74,7 +74,6 @@ stopping at the first.
 """
 
 import ast
-import os
 from pathlib import Path
 
 FOUNDATION_MODULES = frozenset({"db", "models", "queue", "logging_config"})

cloud/evidence_binding.py

@@ -32,7 +32,6 @@
 与 full_auto.audit_record 的 ts 同口径。
 """
 
-import os
 import time
 import uuid
 

cloud/marker_tools.py

@@ -131,7 +131,6 @@ import。DB 助手函数只用 ? 占位符，与 peer_messages 同款写法。
 """
 
 import json
-import os
 import re
 import time
 import uuid

cloud/tests/test_code_search_ext.py

@@ -13,14 +13,12 @@ import unittest
 from pathlib import Path
 
 try:
-    from cloud import websearch as _ws
     from cloud.websearch import (
         CODE_SEARCH_DOMAINS, WebSearchError, _is_code_domain,
         _normalize_allowed_hosts, search)
     from cloud.websearch_mcp import handle_request
 except ImportError:
     sys.path.insert(0, str(Path(__file__).resolve().parents[2]))
-    from cloud import websearch as _ws
     from cloud.websearch import (
         CODE_SEARCH_DOMAINS, WebSearchError, _is_code_domain,
         _normalize_allowed_hosts, search)

cloud/tests/test_websearch_paid_freeze.py

@@ -7,7 +7,6 @@ an error string or a tool result would be caught by assertion.
 """
 
 import json
-import os
 import socket
 import sys
 import unittest