LANTERN P1 step 5 + §8: two-frame identity via FrameId + per-frame gym loadouts

FrameId (replicated frame/class signal) now WRITTEN server-side at spawn for all
players; the two class-HUD readers (ClassPrepPortal, MetaShop) read FrameId (with
an AbilityRef fallback for pre-FrameId players) instead of ClassForAbility. The
gym seeds a PER-FRAME default Spark loadout via ClassTraits.FrameLoadout —
Harpooner (Ranger slot): reel/mobility/skillshots; Bathynaut (Warrior slot):
pull-in/dash/zone-control. FrameId uses ecb.AddComponent (baked on the real
player; absent on the minimal MetaSeeding test prefab). 497 EditMode green.

Deferred to a focused pass (risky wholesale refactor, "still works" via the
transition): full removal of legacy AbilityRef/AbilityCooldown/EffectiveAbility
Stats (woven through equip/class/meta/StatRecompute + tests) and the CharacterId
Bathynaut/Harpooner rename.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Assets/_Project/Scripts/Client/Presentation/MetaShopHudSystem.cs

@@ -76,9 +76,9 @@ namespace ProjectM.Client
             // server-only); tiers from the replicated MetaTierState record on the director ghost.
             byte localClass = ClassTraits.WarriorClass;
             bool haveLocalPlayer = false;
-            foreach (var ar in SystemAPI.Query<RefRO<AbilityRef>>().WithAll<PlayerTag, GhostOwnerIsLocal>())
+            foreach (var (fr, ar) in SystemAPI.Query<RefRO<FrameId>, RefRO<AbilityRef>>().WithAll<PlayerTag, GhostOwnerIsLocal>())
             {
-                localClass = ClassTraits.ClassForAbility(ar.ValueRO.Id);
+                localClass = fr.ValueRO.Value != 0 ? fr.ValueRO.Value : ClassTraits.ClassForAbility(ar.ValueRO.Id); // FrameId signal, AbilityRef fallback
                 haveLocalPlayer = true;
                 break;
             }