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

skills/creative/comfyui/scripts/fetch_logs.py

@@ -15,7 +15,6 @@ Usage:
 from __future__ import annotations
 
 import argparse
-import json
 import sys
 from pathlib import Path
 

skills/creative/comfyui/tests/test_common.py

@@ -2,15 +2,11 @@
 
 from __future__ import annotations
 
-from pathlib import Path
 
 import pytest
 
 from _common import (
-    DEFAULT_LOCAL_HOST,
     EMBEDDING_REGEX,
-    FOLDER_ALIASES,
-    build_cloud_aware_url,
     cloud_endpoint,
     coerce_seed,
     folder_aliases_for,

skills/creative/comfyui/tests/test_extract_schema.py

@@ -2,7 +2,6 @@
 
 from __future__ import annotations
 
-import pytest
 
 from extract_schema import (
     extract_schema,

skills/creative/comfyui/tests/test_run_workflow.py

@@ -2,10 +2,7 @@
 
 from __future__ import annotations
 
-import copy
-import json
 
-import pytest
 
 from extract_schema import extract_schema
 from run_workflow import (

skills/productivity/maps/scripts/maps_client.py

@@ -18,7 +18,6 @@ Commands:
 import argparse
 import json
 import math
-import os
 import sys
 import time
 import urllib.error