feat: multiplayer flee marks player as out for current combat

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

entity/player.go

@@ -34,6 +34,7 @@ type Player struct {
 	Inventory   []Item
 	Relics      []Relic
 	Dead        bool
+	Fled        bool
 }
 
 func NewPlayer(name string, class Class) *Player {
@@ -67,6 +68,10 @@ func (p *Player) IsDead() bool {
 	return p.Dead
 }
 
+func (p *Player) IsOut() bool {
+	return p.Dead || p.Fled
+}
+
 func (p *Player) Revive(hpPercent float64) {
 	p.Dead = false
 	p.HP = int(float64(p.MaxHP) * hpPercent)