new alarm scheme

README.md

@@ -121,7 +121,7 @@ Example with two alarms:
 | `alarm_time` | `string` | Yes | 4-digit HHMM, 24-hour. Fires on the matched minute. |
 | `alarm_days` | `string[]` | No | 3-letter abbreviations: `Mon`–`Sun`. If omitted, fires every day. |
 | `alarm_dates` | `string[]` | No | `MM/DD` strings. Ignored if `alarm_days` is also set. |
-| `alarm_audio` | `string` | No | WAV path, relative to project root. Default: `assets/alarm/alarm_test.wav`. |
+| `alarm_audio` | `string` | No | WAV path, relative to project root. Silent if not set. "default" (case-insensitive) uses `assets/alarm/alarm.wav`. |
 | `alarm_image` | `string` | No | Status PNG path, relative to project root. Default: `assets/img/on_alarm.png`. |
 
 If both `alarm_days` and `alarm_dates` are present, `alarm_days` takes priority.