Base<->Expedition ties: portal rooms, class-at-base, prep spend + Health.Max, C3/C4/Spitter (DR-046)

Portal-gated rooms: new RunLifecycle.RoomExplore loot window; room+nodes
persist past the last kill; PortalInteractRequest -> server-only PortalCommand
advances (client derives the portal pos). RunDirectorSystem moves teardown off
the InRoom edge, relocates the boss-branch/route-gate into the RoomExplore exit,
and advances an empty expedition immediately (incl. a boss clear).

Class-at-base via a shared ClassSwapUtil (meta-band strip + per-class
MetaTierState replay, so the base RPC and the dev SetClass can't drift);
ClassSelectRequest Staging-gated. Per-run PREP buffs (PrepPurchaseRequest,
PrepCatalog): once-per-run == the row's prep StatModifier band is present,
TotalOf-before-Withdraw atomic, stripped on Returning beside the boon band.

Health.Max promoted to [GhostField] (the one ghost-hash re-bake) so the boss +
floating enemy HP bars read it directly. Feel: melee cone connect-thunk (C3),
hit-stop throttle so a horde wipe can't stutter (C4), Spitter cornered-hold.

456/456 EditMode; two adversarial reviews (pre-code 13-confirmed folded;
post-impl clean bar the RoomExplore boss-clear dead-time, fixed).

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

Assets/_Project/Scripts/Simulation/Meta/MetaComponents.cs

@@ -39,6 +39,19 @@ namespace ProjectM.Simulation
         public int ForLayer;
     }
 
+    /// <summary>
+    /// Server-only singleton on the CycleDirector: the room-exit PORTAL interact latch (DR-046). PortalInteractReceiveSystem
+    /// sets <see cref="HasInteract"/> when a player interacts the portal during RoomExplore; RunDirectorSystem (the sole
+    /// RunInfo/RunRuntime writer) reads it to advance the run + tear the room down, then clears it. NOT replicated.
+    /// Added unconditionally at director spawn (like RouteCommand).
+    /// </summary>
+    public struct PortalCommand : IComponentData
+    {
+        /// <summary>1 once a participant has interacted the room-exit portal this RoomExplore.</summary>
+        public byte HasInteract;
+    }
+
+
     /// <summary>
     /// Server-only persisted meta counters on the CycleDirector (mirrored to the replicated <see cref="RunInfo"/> for
     /// the HUD). Added UNCONDITIONALLY at director spawn (like CycleRuntime/ThreatState/RunPhase) so a New-Game boot