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/wordle_fallback.go

@@ -0,0 +1,57 @@
+package plugin
+
+import (
+	"bufio"
+	"log/slog"
+	"math/rand/v2"
+	"os"
+	"strings"
+	"sync"
+)
+
+var (
+	fallbackWords     map[int][]string
+	fallbackWordsOnce sync.Once
+)
+
+// loadFallbackWords loads the emergency word list from data/wordle_words.txt.
+// Each line is one word. Words are grouped by length.
+func loadFallbackWords() {
+	fallbackWords = make(map[int][]string)
+
+	path := "data/wordle_words.txt"
+	f, err := os.Open(path)
+	if err != nil {
+		slog.Warn("wordle: fallback word list not found", "path", path)
+		return
+	}
+	defer f.Close()
+
+	scanner := bufio.NewScanner(f)
+	for scanner.Scan() {
+		word := strings.TrimSpace(scanner.Text())
+		if word == "" || strings.HasPrefix(word, "#") {
+			continue
+		}
+		word = strings.ToUpper(word)
+		n := len([]rune(word))
+		if n >= 5 && n <= 7 {
+			fallbackWords[n] = append(fallbackWords[n], word)
+		}
+	}
+
+	for n, words := range fallbackWords {
+		slog.Info("wordle: loaded fallback words", "length", n, "count", len(words))
+	}
+}
+
+// pickFallbackWord picks a random word of the given length from the fallback list.
+func pickFallbackWord(length int) string {
+	fallbackWordsOnce.Do(loadFallbackWords)
+
+	words := fallbackWords[length]
+	if len(words) == 0 {
+		return ""
+	}
+	return words[rand.IntN(len(words))]
+}