fix: add guild-specific command sync for instant slash command propagation

Global sync can take up to an hour to propagate. Now also syncs commands
per-guild in on_ready for immediate availability.

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

bot.py

@@ -139,8 +139,9 @@ class BCSBot(commands.Bot):
         await self.load_extension("cogs.commands")
         await self.load_extension("cogs.chat")
 
+        # Global sync as fallback; guild-specific sync happens in on_ready
         await self.tree.sync()
-        logger.info("Slash commands synced.")
+        logger.info("Slash commands synced (global).")
 
         # Quick connectivity check
         try:
@@ -165,6 +166,15 @@ class BCSBot(commands.Bot):
     async def on_ready(self):
         logger.info("Logged in as %s (ID: %d)", self.user, self.user.id)
 
+        # Guild-specific command sync for instant propagation
+        for guild in self.guilds:
+            try:
+                self.tree.copy_global_to(guild=guild)
+                await self.tree.sync(guild=guild)
+                logger.info("Slash commands synced to guild %s.", guild.name)
+            except Exception:
+                logger.exception("Failed to sync commands to guild %s", guild.name)
+
         # Set status based on active mode
         mode_config = self.get_mode_config()
         status_text = mode_config.get("description") or self.config.get("bot", {}).get(