feat: add chat emote system (/hi, /gg, /go, /wait, /help)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

game/emote.go

@@ -0,0 +1,17 @@
+package game
+
+var emotes = map[string]string{
+	"/hi":   "👋 waves hello!",
+	"/gg":   "🎉 says GG!",
+	"/go":   "⚔️ says Let's go!",
+	"/wait": "✋ says Wait!",
+	"/help": "🆘 calls for help!",
+}
+
+func ParseEmote(input string) (string, bool) {
+	if input == "" {
+		return "", false
+	}
+	text, ok := emotes[input]
+	return text, ok
+}

game/emote_test.go

@@ -0,0 +1,31 @@
+package game
+
+import "testing"
+
+func TestParseEmote(t *testing.T) {
+	tests := []struct {
+		input    string
+		isEmote  bool
+		expected string
+	}{
+		{"/hi", true, "👋 waves hello!"},
+		{"/gg", true, "🎉 says GG!"},
+		{"/go", true, "⚔️ says Let's go!"},
+		{"/wait", true, "✋ says Wait!"},
+		{"/help", true, "🆘 calls for help!"},
+		{"/unknown", false, ""},
+		{"hello", false, ""},
+		{"", false, ""},
+	}
+	for _, tt := range tests {
+		t.Run(tt.input, func(t *testing.T) {
+			result, ok := ParseEmote(tt.input)
+			if ok != tt.isEmote {
+				t.Errorf("ParseEmote(%q) isEmote = %v, want %v", tt.input, ok, tt.isEmote)
+			}
+			if ok && result != tt.expected {
+				t.Errorf("ParseEmote(%q) = %q, want %q", tt.input, result, tt.expected)
+			}
+		})
+	}
+}

game/session.go

@@ -361,7 +361,11 @@ func (s *GameSession) BuyItem(playerID string, itemIdx int) bool {
 func (s *GameSession) SendChat(playerName, message string) {
 	s.mu.Lock()
 	defer s.mu.Unlock()
+	if emoteText, ok := ParseEmote(message); ok {
+		s.addLog(fmt.Sprintf("✨ %s %s", playerName, emoteText))
+	} else {
 		s.addLog(fmt.Sprintf("[%s] %s", playerName, message))
+	}
 }
 
 // LeaveShop exits the shop phase