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/Prefabs/EnemySpitter.prefab

@@ -873,10 +873,10 @@ MonoBehaviour:
   m_EditorClassIdentifier: ProjectM.Authoring::ProjectM.Authoring.EnemyAuthoring
   MaxHealth: 28
   HitRadius: 1
-  MoveSpeed: 3
+  MoveSpeed: 2.4
   AttackRange: 1.8
   AttackDamage: 8
-  AttackCooldownTicks: 66
+  AttackCooldownTicks: 90
 --- !u!95 &13761174629013833
 Animator:
   serializedVersion: 7
@@ -938,8 +938,8 @@ MonoBehaviour:
   m_EditorClassIdentifier: ProjectM.Authoring::ProjectM.Authoring.SpitterAuthoring
   PreferredRange: 9
   RangeTolerance: 1.5
-  ProjectileSpeed: 11
-  CorneredRange: 3
+  ProjectileSpeed: 8
+  CorneredRange: 6
   WindupTicks: 26
 --- !u!1 &3924377442331254583
 GameObject: