fix: verify /proc/PID/cmdline in isRinging to prevent PID reuse false positives

api/schema.py

@@ -19,12 +19,15 @@ def is_wecker_ringing() -> bool:
     if not os.path.exists(PID_FILE):
         return False
     try:
-        pid: int
         with open(PID_FILE) as f:
             pid = int(f.read().strip())
         os.kill(pid, 0)
-        return True
-    except (ValueError, ProcessLookupError, PermissionError, OSError):
+        # Guard against PID reuse: verify the running process is actually wecker.py.
+        cmdline_path = f"/proc/{pid}/cmdline"
+        with open(cmdline_path, "rb") as f:
+            cmdline = f.read().replace(b"\0", b" ").decode()
+        return "wecker.py" in cmdline
+    except (ValueError, ProcessLookupError, PermissionError, OSError, FileNotFoundError):
         return False