wyr: track real reaction votes and announce winner with counts

- Add _WYR_POLLS dict keyed by poll event_id to accumulate votes
- record_wyr_vote() called from callbacks.reaction() on every reaction
- reveal() reads actual vote counts and announces winner with percentage
- Handles tie and zero-vote cases
- Remove the useless 'check the reactions above' message

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

matrixbot/callbacks.py

@@ -4,7 +4,7 @@ from functools import wraps
 from nio import AsyncClient
 
 from config import BOT_PREFIX, MATRIX_USER_ID
-from commands import COMMANDS, metrics, check_scramble_answer, check_riddle_answer
+from commands import COMMANDS, metrics, check_scramble_answer, check_riddle_answer, record_wyr_vote
 from welcome import handle_welcome_reaction, handle_space_join, SPACE_ROOM_ID
 
 logger = logging.getLogger("matrixbot")
@@ -94,6 +94,7 @@ class Callbacks:
         await handle_welcome_reaction(
             self.client, room.room_id, event.sender, reacted_event_id, key
         )
+        record_wyr_vote(reacted_event_id, event.sender, key)
 
     async def member(self, room, event):
         """Handle m.room.member events — watch for Space joins."""