feat(assassin): add stealth and double jump

design/user-stories/us-005-use-assassin-abilities.md

@@ -2,7 +2,7 @@
 type: User Story
 title: "US-005: Use Assassin abilities"
 description: Give the Assassin timed stealth and a risky burst-mobility ability.
-status: backlog
+status: done
 ---
 
 # US-005: Use Assassin abilities
@@ -11,15 +11,15 @@ As the **Assassin**, I want stealth and burst mobility so that I can ambush oppo
 
 ## Acceptance criteria
 
-- [ ] The Assassin can activate ten minutes of invisibility once per rolling hour using the named Assassin ability item.
-- [ ] Invisibility displays no potion particles.
-- [ ] Activation while in the same world and within the configured Tyrant range grants twenty minutes instead.
-- [ ] Proximity is evaluated when the ability is activated and does not alter the active duration afterward.
-- [ ] The Assassin can double-jump once every 60 seconds without requiring an item.
-- [ ] A successful double-jump grants Speed for 15 seconds and Weakness III for 20 seconds.
-- [ ] Grounding and supported movement reset jump availability only after the 60-second cooldown has elapsed.
-- [ ] Ability cooldowns use unpaused elapsed time and survive death, logout, and restart.
-- [ ] The player can inspect remaining cooldowns and receives clear feedback when an activation is unavailable.
+- [x] The Assassin can activate ten minutes of invisibility once per rolling hour using the named Assassin ability item.
+- [x] Invisibility displays no potion particles.
+- [x] Activation while in the same world and within the configured Tyrant range grants twenty minutes instead.
+- [x] Proximity is evaluated when the ability is activated and does not alter the active duration afterward.
+- [x] The Assassin can double-jump once every 60 seconds without requiring an item.
+- [x] A successful double-jump grants Speed for 15 seconds and Weakness III for 20 seconds.
+- [x] Grounding and supported movement reset jump availability only after the 60-second cooldown has elapsed.
+- [x] Ability cooldowns use unpaused elapsed time and survive death, logout, and restart.
+- [x] The player can inspect remaining cooldowns and receives clear feedback when an activation is unavailable.
 
 ## Related
 

design/user-stories/us-014-use-class-ability-items.md

@@ -2,7 +2,7 @@
 type: User Story
 title: "US-014: Use class ability items"
 description: Give class holders named bound items that activate abilities without enabling transfer or cooldown bypasses.
-status: backlog
+status: in-progress
 ---
 
 # US-014: Use class ability items