Add action economy split and cross-plugin chat level lookup (Adventure 2.5 steps 1-2)

Action economy: replace single daily action with 1 combat + 3 harvest
actions per day. Holidays grant +1 to each bucket. Rest consumes all
remaining actions. Arena remains outside both buckets.

- Add CombatActionsUsed/HarvestActionsUsed counters to AdventureCharacter
- Add CanDoCombat/CanDoHarvest/AllActionsUsed/HasActedToday helpers
- Update all 14 ActionTakenToday check sites across adventure, scheduler,
  babysit, twinbee, events, and render
- Morning DM shows action budget and grays out exhausted categories
- Activity resolution checks per-bucket availability before proceeding
- Midnight reset zeros both counters
- Post-action nudge shows remaining actions instead of holiday prompt

Cross-plugin lookup: export XPPlugin.GetLevel(), wire into AdventurePlugin
via p.chatLevel(userID) for upcoming chat level perks.

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

main.go

@@ -132,7 +132,7 @@ func main() {
 	registry.Register(plugin.NewBlackjackPlugin(client, euroPlugin))
 	registry.Register(plugin.NewUnoPlugin(client, euroPlugin))
 	registry.Register(plugin.NewHoldemPlugin(client, euroPlugin))
-	adventurePlugin := plugin.NewAdventurePlugin(client, euroPlugin)
+	adventurePlugin := plugin.NewAdventurePlugin(client, euroPlugin, xpPlugin)
 	registry.Register(adventurePlugin)
 	wordlePlugin := plugin.NewWordlePlugin(client, euroPlugin, dictClient)
 	registry.Register(wordlePlugin)