Add Phase 2: integrations, admin, and remaining commands

New commands: agent, trivia (with 30s timer reveal), ask (Ollama LLM
with cooldown), minecraft (RCON whitelist), health (admin-only metrics).
Adds metrics tracking, per-user cooldowns, and admin permission checks.

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

callbacks.py

@@ -4,7 +4,7 @@ from functools import wraps
 from nio import AsyncClient, RoomMessageText
 
 from config import BOT_PREFIX, MATRIX_USER_ID
-from commands import COMMANDS
+from commands import COMMANDS, metrics
 
 logger = logging.getLogger("matrixbot")
 
@@ -16,6 +16,7 @@ def handle_command_errors(func):
             return await func(client, room_id, sender, args)
         except Exception as e:
             logger.error(f"Error in command {func.__name__}: {e}", exc_info=True)
+            metrics.record_error(func.__name__)
             try:
                 from utils import send_text
                 await send_text(client, room_id, "An unexpected error occurred. Please try again later.")
@@ -56,5 +57,6 @@ class Callbacks:
             return
 
         handler, _ = handler_entry
+        metrics.record_command(cmd_name)
         wrapped = handle_command_errors(handler)
         await wrapped(self.client, room.room_id, event.sender, args)