Windows watchdog does a hard kill, not graceful shutdown #282

Location: main.py:142
Severity: MED

os.kill(os.getpid(), SIGTERM) on Windows is TerminateProcess — the “so uvicorn runs its shutdown sequence” comment doesn’t hold there. Low impact today (registry persists per-job), but any future shutdown hook silently won’t run on Windows desktop.
On os.name == "nt", signal uvicorn’s Server.should_exit instead (or send CTRL_BREAK_EVENT to the process group).

From the health report. Part of #273 (Phase 2 — Resilience).