Add adventure plugin, holdem CFR fixes, and wordle plugin

Adventure: Complete v1 daily idle RPG with DM-driven gameplay, equipment
shop, treasure system, TwinBee NPC, streak/grudge/party mechanics,
flavor text, and scheduled morning/evening/midnight tickers.

Holdem CFR: Fix three critical training bugs (fold not forfeiting pot,
free calls after raises, training/runtime key mismatch). Add performance
optimizations (preflop lookup table, zero-alloc equity, integer keys,
raise cap, regret pruning). Enrich abstraction with 12 equity buckets,
board texture dimension, and 6-char action history. Replace validation
with proper multi-street simulation.

Also includes wordle plugin, holdem seed tooling, and schema additions.

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

internal/plugin/adventure_shop.go

@@ -0,0 +1,187 @@
+package plugin
+
+import (
+	"fmt"
+	"strings"
+
+	"maunium.net/go/mautrix/id"
+)
+
+// ── Shop Listings ────────────────────────────────────────────────────────────
+
+func advShopListings(equip map[EquipmentSlot]*AdvEquipment, balance float64) string {
+	var sb strings.Builder
+	sb.WriteString("🛒 **Equipment Shop**\n")
+	sb.WriteString(fmt.Sprintf("💰 Your balance: €%.0f\n\n", balance))
+
+	for _, slot := range allSlots {
+		current := equip[slot]
+		currentTier := 0
+		if current != nil {
+			currentTier = current.Tier
+		}
+
+		defs := equipmentTiers[slot]
+		currentName := "None"
+		if current != nil {
+			currentName = current.Name
+		}
+		sb.WriteString(fmt.Sprintf("**%s** (current: %s, Tier %d)\n", strings.Title(string(slot)), currentName, currentTier))
+
+		hasUpgrades := false
+		for _, def := range defs {
+			if def.Tier <= currentTier || def.Price == 0 {
+				continue
+			}
+			hasUpgrades = true
+			affordable := ""
+			if balance < def.Price {
+				affordable = " ❌"
+			}
+			sb.WriteString(fmt.Sprintf("  Tier %d: %s — €%.0f%s\n", def.Tier, def.Name, def.Price, affordable))
+			sb.WriteString(fmt.Sprintf("    _%s_\n", advTruncate(def.Description, 120)))
+		}
+		if !hasUpgrades {
+			sb.WriteString("  ✨ Max tier reached!\n")
+		}
+		sb.WriteString("\n")
+	}
+
+	sb.WriteString("To buy: reply with `buy <item name>`\n")
+	sb.WriteString("Example: `buy Sad Iron Sword`")
+	return sb.String()
+}
+
+func advTruncate(s string, n int) string {
+	if len(s) <= n {
+		return s
+	}
+	return s[:n-3] + "..."
+}
+
+// ── Find Shop Item ───────────────────────────────────────────────────────────
+
+func advFindShopItem(name string) (EquipmentSlot, *EquipmentDef, bool) {
+	name = strings.ToLower(strings.TrimSpace(name))
+	for _, slot := range allSlots {
+		for i := range equipmentTiers[slot] {
+			def := &equipmentTiers[slot][i]
+			if def.Price == 0 {
+				continue // can't buy tier 0
+			}
+			if strings.EqualFold(def.Name, name) || containsFold(def.Name, name) {
+				return slot, def, true
+			}
+		}
+	}
+	return "", nil, false
+}
+
+// ── Buy Equipment ────────────────────────────────────────────────────────────
+
+func (p *AdventurePlugin) advBuyEquipment(userID id.UserID, slot EquipmentSlot, def *EquipmentDef, equip map[EquipmentSlot]*AdvEquipment) string {
+	current := equip[slot]
+	if current != nil && current.Tier >= def.Tier {
+		return fmt.Sprintf("You already have %s (Tier %d). %s is Tier %d. That's not an upgrade, that's a lateral move at best.",
+			current.Name, current.Tier, def.Name, def.Tier)
+	}
+
+	balance := p.euro.GetBalance(userID)
+	if balance < def.Price {
+		return fmt.Sprintf("You cannot afford %s. You have €%.0f. %s costs €%.0f. "+
+			"The gap between these numbers is both mathematical and deeply personal. "+
+			"Go do something about it. Not gambling. You know what I mean.",
+			def.Name, balance, def.Name, def.Price)
+	}
+
+	if !p.euro.Debit(userID, def.Price, "adventure_shop_"+string(slot)) {
+		return "Transaction failed. The economy is having a moment."
+	}
+
+	// Update equipment
+	eq := &AdvEquipment{
+		Slot:       slot,
+		Tier:       def.Tier,
+		Condition:  100,
+		Name:       def.Name,
+		ActionsUsed: 0,
+	}
+	if err := saveAdvEquipment(userID, eq); err != nil {
+		// Refund on DB error
+		p.euro.Credit(userID, def.Price, "adventure_shop_refund")
+		return "Something went wrong saving your equipment. You've been refunded."
+	}
+	equip[slot] = eq
+
+	return fmt.Sprintf("You have purchased **%s** for €%.0f.\n\n_%s_\n\n"+
+		"This is an upgrade over what you had. That bar was underground, but you cleared it. "+
+		"Equip it now before you do something stupid with the money instead.",
+		def.Name, def.Price, def.Description)
+}
+
+// ── Sell Items ────────────────────────────────────────────────────────────────
+
+func (p *AdventurePlugin) advSellAll(userID id.UserID) string {
+	items, err := clearAdvInventory(userID)
+	if err != nil {
+		return "Failed to access your inventory. Try again."
+	}
+	if len(items) == 0 {
+		return "Your inventory is empty. There is nothing to sell. This is a metaphor for something but now is not the time."
+	}
+
+	var total float64
+	for _, item := range items {
+		total += float64(item.Value)
+	}
+
+	p.euro.Credit(userID, total, "adventure_sell_all")
+
+	return fmt.Sprintf("Sold %d items for **€%.0f**.\n\nThe merchant took everything without comment. "+
+		"This is the most respect anyone has shown your loot collection. Take the money.",
+		len(items), total)
+}
+
+func (p *AdventurePlugin) advSellItem(userID id.UserID, itemName string) string {
+	items, err := loadAdvInventory(userID)
+	if err != nil {
+		return "Failed to access your inventory."
+	}
+
+	// Fuzzy match
+	for _, item := range items {
+		if containsFold(item.Name, itemName) {
+			if err := removeAdvInventoryItem(item.ID); err != nil {
+				return "Failed to sell that item."
+			}
+			p.euro.Credit(userID, float64(item.Value), "adventure_sell_"+item.Name)
+			return fmt.Sprintf("Sold **%s** for **€%d**. The merchant nodded. That's it. That's the transaction.", item.Name, item.Value)
+		}
+	}
+
+	return fmt.Sprintf("No item matching '%s' found in your inventory.", itemName)
+}
+
+// ── Inventory Display ────────────────────────────────────────────────────────
+
+func advInventoryDisplay(userID id.UserID) string {
+	items, err := loadAdvInventory(userID)
+	if err != nil {
+		return "Failed to load inventory."
+	}
+	if len(items) == 0 {
+		return "🎒 Your inventory is empty. Go adventure."
+	}
+
+	var sb strings.Builder
+	sb.WriteString("🎒 **Inventory**\n\n")
+
+	var total int64
+	for _, item := range items {
+		sb.WriteString(fmt.Sprintf("  %s (T%d %s) — €%d\n", item.Name, item.Tier, item.Type, item.Value))
+		total += item.Value
+	}
+	sb.WriteString(fmt.Sprintf("\n%d items — total value ~€%d", len(items), total))
+	sb.WriteString("\n\nTo sell: `!adventure sell all` or `!adventure sell <item>`")
+	return sb.String()
+}