chore: remove unused imports and dead locals (ruff F401, F841) (#17010)

Mechanical cleanup across 43 files — removes 46 unused imports
(F401) and 14 unused local variables (F841) detected by
`ruff check --select F401,F841`. Net: -49 lines.

Also fixes a latent NameError in rl_cli.py where `get_hermes_home()`
was called at module line 32 before its import at line 65 — the
module never imported successfully on main. The ruff audit surfaced
this because it correctly saw the symbol as imported-but-unused
(the call happened before the import ran); the fix moves the import
to the top of the file alongside other stdlib imports.

One `# noqa: F401` kept in hermes_cli/status.py for `subprocess`:
tests monkeypatch `hermes_cli.status.subprocess` as a regression
guard that systemctl isn't called on Termux, so the name must
exist at module scope even though the module body doesn't reference
it. Docstring explains the reason.

Also fixes an invalid `# noqa:` directive in
gateway/platforms/discord.py:308 that lacked a rule code.

Co-authored-by: teknium1 <teknium@users.noreply.github.com>

tools/browser_cdp_tool.py

@@ -20,7 +20,6 @@ from __future__ import annotations
 import asyncio
 import json
 import logging
-import os
 from typing import Any, Dict, Optional
 
 from tools.registry import registry, tool_error

tools/browser_supervisor.py

@@ -25,7 +25,7 @@ import json
 import logging
 import threading
 import time
-from dataclasses import dataclass, field
+from dataclasses import dataclass
 from typing import Any, Dict, List, Optional, Tuple
 
 import websockets

tools/browser_tool.py

@@ -526,7 +526,6 @@ def _url_is_private(url: str) -> bool:
     backend is configured, which will surface the DNS error naturally).
     """
     try:
-        from tools.url_safety import is_safe_url
         # is_safe_url returns False for private/loopback/link-local/CGNAT AND
         # for DNS failures.  We only want the private-network case here, so
         # we parse + check the host shape as a DNS-failure sieve first.

tools/delegate_tool.py

@@ -27,7 +27,6 @@ import time
 from concurrent.futures import (
     ThreadPoolExecutor,
     TimeoutError as FuturesTimeoutError,
-    as_completed,
 )
 from typing import Any, Dict, List, Optional
 

tools/file_operations.py

@@ -32,7 +32,6 @@ from abc import ABC, abstractmethod
 from dataclasses import dataclass, field
 from typing import Optional, List, Dict, Any
 from pathlib import Path
-from hermes_constants import get_hermes_home
 from tools.binary_extensions import BINARY_EXTENSIONS
 
 from agent.file_safety import (

tools/file_tools.py

@@ -7,7 +7,6 @@ import logging
 import os
 import threading
 from pathlib import Path
-from typing import Optional
 
 from agent.file_safety import get_read_block_error
 from tools.binary_extensions import has_binary_extension

tools/transcription_tools.py

@@ -836,7 +836,6 @@ def transcribe_audio(file_path: str, model: Optional[str] = None) -> Dict[str, A
         return _transcribe_mistral(file_path, model_name)
 
     if provider == "xai":
-        xai_cfg = stt_config.get("xai", {})
         # xAI Grok STT doesn't use a model parameter — pass through for logging
         model_name = model or "grok-stt"
         return _transcribe_xai(file_path, model_name)

tools/yuanbao_tools.py

@@ -20,7 +20,7 @@ from __future__ import annotations
 
 import logging
 from pathlib import Path
-from typing import TYPE_CHECKING, List, Optional, Tuple
+from typing import List, Optional, Tuple
 
 logger = logging.getLogger(__name__)
 
@@ -34,10 +34,6 @@ def _get_active_adapter():
         return None
 
 
-if TYPE_CHECKING:
-    from gateway.platforms.yuanbao import YuanbaoAdapter
-
-
 # ---------------------------------------------------------------------------
 # 角色标签
 # ---------------------------------------------------------------------------
@@ -418,7 +414,7 @@ async def send_dm(
 # Registry registration
 # ---------------------------------------------------------------------------
 
-from tools.registry import registry, tool_result, tool_error  # noqa: E402
+from tools.registry import registry, tool_result  # noqa: E402
 
 
 def _check_yuanbao():