feat(assassin): add stealth and double jump

design/log.md

@@ -6,6 +6,21 @@ description: Chronological record of material decisions affecting the Spigot Tyr
 
 # Spigot Tyrant Design Log
 
+## 2026-08-14 — Assassin completed
+
+- Completed US-005 with named owner-bound Assassin Cloak activation, one-hour cooldown, particle-free ten-minute invisibility, and activation-time doubling within the Tyrant's configurable range.
+- Added 60-second double-jump gating, upward launch, 15-second Speed, 20-second Weakness III, and grounded readiness restoration.
+- Active effects and cooldowns persist as UTC deadlines and are continuously restored after death, login, milk, or ordinary removal while valid.
+- Verified duration tiers, cooldown consumption and refresh, jump effect deadlines, class constraints, persistence, and the full Gradle build.
+
+## 2026-08-14 — Assassin implementation started
+
+- US-005 begins with test-first bound-item invisibility, near-Tyrant duration doubling, and cooldown-gated double-jump effects.
+
+## 2026-08-14 — Bound ability item implementation started
+
+- US-014 begins with test-first item readiness and recovery, owner metadata, transfer prevention, cooldown redelivery, and Tamer item permanence.
+
 ## 2026-08-14 — Vigilante and Followers completed
 
 - Completed US-008 with `/vigilante` invitation, acceptance, dismissal, and leave flows while preserving independent Tyrant-side class assignments.