feat(combat): opt out attacking players

design/user-stories/us-002-relinquish-protection-when-attacking.md

@@ -2,7 +2,7 @@
 type: User Story
 title: "US-002: Relinquish protection when attacking"
 description: Remove Leaf protection when an opted-in player attacks another player.
-status: backlog
+status: done
 ---
 
 # US-002: Relinquish protection when attacking
@@ -11,17 +11,17 @@ As a **player facing PvP**, I want Leaf protection to belong only to non-aggress
 
 ## Acceptance criteria
 
-- [ ] When an opted-in player damages another player, Leaf automatically changes the attacker's saved choice to opted out.
-- [ ] Automatic opt-out immediately removes Leaf-managed Resistance and the attacker's leaf prefix.
-- [ ] The attacker receives a clear chat message explaining that attacking another player disabled Leaf and that they may opt in again when permitted.
-- [ ] Receiving player-caused damage without retaliating does not change the protected player's choice or Resistance.
-- [ ] Retaliatory damage counts as attacking, including Thorns damage attributable to the protected player.
-- [ ] Direct melee attacks and player-fired projectiles are attributed to the attacking player.
-- [ ] Harmful splash or lingering potion damage is attributed to the player who threw the potion.
-- [ ] Damage caused by a tamed animal is attributed to its player owner when Spigot exposes that ownership.
-- [ ] TNT, fire, and other indirect damage trigger opt-out only when Spigot exposes a reliable responsible player; ambiguous environmental damage does not opt out an innocent player.
-- [ ] PvP-triggered opt-out applies even when an administrator has locked the player's preference.
-- [ ] A single attack produces no duplicate state changes or duplicate notifications.
+- [x] When an opted-in player damages another player, Leaf automatically changes the attacker's saved choice to opted out.
+- [x] Automatic opt-out immediately removes Leaf-managed Resistance and the attacker's leaf prefix.
+- [x] The attacker receives a clear chat message explaining that attacking another player disabled Leaf and that they may opt in again when permitted.
+- [x] Receiving player-caused damage without retaliating does not change the protected player's choice or Resistance.
+- [x] Retaliatory damage counts as attacking, including Thorns damage attributable to the protected player.
+- [x] Direct melee attacks and player-fired projectiles are attributed to the attacking player.
+- [x] Harmful splash or lingering potion damage is attributed to the player who threw the potion.
+- [x] Damage caused by a tamed animal is attributed to its player owner when Spigot exposes that ownership.
+- [x] TNT, fire, and other indirect damage trigger opt-out only when Spigot exposes a reliable responsible player; ambiguous environmental damage does not opt out an innocent player.
+- [x] PvP-triggered opt-out applies even when an administrator has locked the player's preference.
+- [x] A single attack produces no duplicate state changes or duplicate notifications.
 
 ## Related