feat: add unload reminder to Washing Machine

- Send a reminder N minutes after cycle completion, with optional repeats
- Auto-cancel reminders when a new cycle starts or a door/lid sensor opens
- Gate the completion timestamp on configured door sensors being closed
- Track completion time (cct) and reminder count (urc) in persistent state

Common/Washing Machine/README.md

@@ -7,6 +7,7 @@ This blueprint monitors washing machine or dryer appliances and sends notificati
 - Start notification with cycle duration, estimated end time, and mode details
 - Completion notification (reminder to unload clothes) with energy report
 - "Almost done" notification (configurable minutes before end)
+- Unload reminder (configurable delay, optional repeats) — auto-cancelled when a new cycle starts or a configured door/lid sensor opens
 - Pause/Resume notifications (detect when cycle is paused or resumed)
 - Error message notifications
 - Preparation mode notification (e.g., for dryer prep)
@@ -39,6 +40,8 @@ The automation tracks the appliance through these states:
 | `cst` | Cycle Start Time (ISO timestamp) |
 | `esmp` | Energy Samples accumulator (Wh) |
 | `lst` | Last Sample Time (ISO timestamp) |
+| `cct` | Cycle Completion Time (ISO timestamp, drives unload reminder) |
+| `urc` | Unload Reminder Count (number of reminders already sent) |
 
 ## Message Template Variables
 
@@ -49,7 +52,7 @@ All message templates support these placeholder variables (use single braces):
 | `{appliance_name}` | Device name (e.g., "Washing Machine") |
 | `{remaining}` | Remaining time as string (e.g., "01:30:00") |
 | `{estimated_end}` | Estimated completion time (e.g., "14:30") |
-| `{minutes}` | Remaining minutes as number (e.g., 90) |
+| `{minutes}` | Remaining minutes (almost-done) or elapsed minutes since completion (unload reminder) |
 | `{error}` | Error message text (only in error notification) |
 | `{tub_count}` | Tub clean counter value (only in tub clean notification) |
 | `{tub_threshold}` | Tub clean threshold (only in tub clean notification) |
@@ -64,6 +67,18 @@ All message templates support these placeholder variables (use single braces):
 - Notification service entity
 - (Optional) Power sensor for energy tracking
 
+## Unload Reminder
+
+If `Unload Reminder Delay` is greater than 0, the automation:
+
+1. Records the completion timestamp (`cct`) when the cycle finishes — but **only if** every door sensor in `Unload Reminder Door Sensors` is currently closed (or the list is empty).
+2. Sends a reminder N minutes later (where N = delay), then optionally repeats every `Unload Reminder Repeat Interval` minutes up to `Unload Reminder Repeat Count` total.
+3. Cancels all pending reminders when:
+   - A new cycle starts (start handler clears `cct` and `urc`), **or**
+   - Any of the configured door / lid sensors transitions to `on` (treated as "user has unloaded").
+
+The check runs once per minute via a `time_pattern` trigger. The door sensor list is optional — leave it empty to keep reminders purely time-based.
+
 ## Note
 
 Default messages are in Russian for LG ThinQ integration. Customize messages in the "Messages" section for your language.