simplify(compat): interrupt — drop _ThreadAwareEventProxy/_interrupt_event legacy alias, repoint 2 test files

No runtime consumer read the proxy (terminal_tool/environments call is_interrupted()/set_interrupt()
directly); its only users were tests patching tools.interrupt._interrupt_event, which had no effect on
the code under test. tools/terminal_tool.py's own re-export of the name is owned by another worker.

hermes_cli/web_server_dashboard.py

@@ -18,8 +18,7 @@ from fastapi.responses import FileResponse, HTMLResponse, JSONResponse, Response
 from fastapi.staticfiles import StaticFiles
 from pathlib import Path
 from typing import Any, Dict, List, Optional
-from hermes_cli.config import cfg_get
-from hermes_constants import get_process_hermes_home
+from hermes_cli.config import cfg_get, get_process_hermes_home
 from utils import env_var_enabled
 
 # Same logger the code used before extraction (record parity).