chore: prune unused imports and duplicate import redefinitions

Remove unused imports (F401) and duplicate/shadowed import
redefinitions (F811) across the codebase using ruff's safe
autofixes. No behavioral changes -- imports only.

- ~1400 safe autofixes applied across 644 files (net -1072 lines)
- __init__.py re-exports preserved (excluded from F401 removal so
  public re-export surfaces stay intact)
- Re-exports that are imported or monkeypatched by tests but look
  unused in their defining module are kept with explicit # noqa:
  F401 (gateway/run.py load_dotenv; run_agent re-exports from
  agent.message_sanitization, agent.context_compressor,
  agent.retry_utils, agent.prompt_builder, agent.process_bootstrap,
  agent.codex_responses_adapter)
- Unsafe F841 (unused-variable) fixes deliberately skipped -- those
  can change behavior when the RHS has side effects
- ruff lints remain disabled in pyproject.toml (only PLW1514 is
  selected); this is a one-time cleanup, not a config change

Verification:
- python -m compileall: clean
- pytest --collect-only: all 27161 tests collect (zero import errors)
- core entry points import clean (run_agent, model_tools, cli,
  toolsets, hermes_state, batch_runner, gateway)
- static scan: every name any test imports directly from an edited
  module still resolves

tests/agent/test_crossloop_client_cache.py

@@ -10,9 +10,7 @@ so it can run without optional dependencies like firecrawl.
 
 import asyncio
 import threading
-from concurrent.futures import ThreadPoolExecutor
 from unittest.mock import patch, MagicMock
-from types import SimpleNamespace
 
 import pytest
 
@@ -32,7 +30,6 @@ def _stub_resolve_provider_client(provider, model, async_mode, **kw):
 @pytest.fixture(autouse=True)
 def _clean_client_cache():
     """Clear the client cache before each test."""
-    import importlib
     # We need to patch before importing
     with patch.dict("sys.modules", {}):
         pass
@@ -48,7 +45,7 @@ class TestCrossLoopCacheIsolation:
 
     def test_same_loop_reuses_client(self):
         """Within a single event loop, the same client should be returned."""
-        from agent.auxiliary_client import _get_cached_client, _client_cache
+        from agent.auxiliary_client import _get_cached_client
 
         loop = asyncio.new_event_loop()
         asyncio.set_event_loop(loop)