hangman: edit board in place + fix ASCII art rendering; wyr: debug reaction logging

- Add edit_html() to utils using m.replace so messages can be updated
- Hangman board now edits in place on every guess — shows progressing
  ASCII figure as wrong guesses accumulate instead of spamming new messages
- Extract _hangman_board_html() helper for consistent board rendering
- wyr: add INFO-level logging to reaction callback to diagnose vote tracking

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

matrixbot/callbacks.py

@@ -81,19 +81,29 @@ class Callbacks:
 
         # m.reaction events come as UnknownEvent with type "m.reaction"
         if not hasattr(event, "source"):
+            logger.info("reaction: event has no source attr, type=%s sender=%s", type(event).__name__, event.sender)
             return
 
+        event_type = event.source.get("type", "")
         content = event.source.get("content", {})
         relates_to = content.get("m.relates_to", {})
-        if relates_to.get("rel_type") != "m.annotation":
-            return
-
+        rel_type = relates_to.get("rel_type", "")
         reacted_event_id = relates_to.get("event_id", "")
         key = relates_to.get("key", "")
 
+        logger.info(
+            "reaction: type=%s rel_type=%s key=%r target=%s sender=%s",
+            event_type, rel_type, key, reacted_event_id[:16] if reacted_event_id else "", event.sender,
+        )
+
+        if rel_type != "m.annotation":
+            return
+
         await handle_welcome_reaction(
             self.client, room.room_id, event.sender, reacted_event_id, key
         )
+        from commands import _WYR_POLLS
+        logger.info("reaction: wyr polls active=%s matched=%s", list(_WYR_POLLS.keys()), reacted_event_id in _WYR_POLLS)
         record_wyr_vote(reacted_event_id, event.sender, key)
 
     async def member(self, room, event):