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/utils.py

@@ -87,6 +87,31 @@ async def send_html(client: AsyncClient, room_id: str, plain: str, html: str):
     return resp
 
 
+async def edit_html(client: AsyncClient, room_id: str, event_id: str, plain: str, html: str):
+    """Edit an existing message in place using m.replace."""
+    logger = logging.getLogger("matrixbot")
+    content = {
+        "msgtype": "m.text",
+        "body": f"* {plain}",
+        "format": "org.matrix.custom.html",
+        "formatted_body": html,
+        "m.new_content": {
+            "msgtype": "m.text",
+            "body": plain,
+            "format": "org.matrix.custom.html",
+            "formatted_body": html,
+        },
+        "m.relates_to": {
+            "rel_type": "m.replace",
+            "event_id": event_id,
+        },
+    }
+    resp = await _room_send_trusted(client, room_id, message_type="m.room.message", content=content)
+    if not isinstance(resp, RoomSendResponse):
+        logger.error("edit_html failed: %s", resp)
+    return resp
+
+
 async def send_reaction(client: AsyncClient, room_id: str, event_id: str, emoji: str):
     return await _room_send_trusted(
         client, room_id,