chore: clean local tooling and deployment artifacts

harness/tht/cli/preprocess_cmd.py

@@ -4,7 +4,6 @@ from __future__ import annotations
 
 import hashlib
 import json
-import os
 import re
 from pathlib import Path
 
@@ -260,7 +259,7 @@ def dwh_cmd(
         raise typer.Exit(code=2)
     try:
         result = run_dwh_from_config(config, steps=selected, resume=resume)
-    except Exception as exc:  # noqa: BLE001
+    except Exception:  # noqa: BLE001
         payload = {"status": "failed", "error": "DWH preprocessing failed"}
         if json_output:
             typer.echo(json.dumps(payload, sort_keys=True))