fix(streaming): block login on complete world reveal

Make initial login and portal arrival consume one WorldRevealReadinessBarrier that joins near-tier mesh publication, destination composite uploads, and collision residency before normal world geometry becomes visible. This ports retail SmartBox's blocking-cell completion edge into the asynchronous client instead of exposing a ground-only login.

Add focused outdoor, indoor, texture, and invalid-claim tests; update the retail pseudocode, architecture, divergence record, issue ledger, roadmap baseline, and synchronized agent guidance.

Co-authored-by: OpenAI Codex <codex@openai.com>

src/AcDream.App/Input/PlayerModeAutoEntry.cs

@@ -11,8 +11,8 @@ namespace AcDream.App.Input;
 /// Why is this its own class? The auto-entry has four independent
 /// preconditions (live session reaches <c>InWorld</c>, the player
 /// entity has been streamed into the world dictionary, the player
-/// movement controller is constructible, and the terrain under the
-/// spawn position has streamed in) plus a manual-override path
+/// movement controller is constructible, and the initial world is fully
+/// drawable and collidable) plus a manual-override path
 /// (the user can flip into fly mode before the auto-entry fires —
 /// their choice wins). All five interact with each other in a way
 /// that's painful to test through GameWindow but trivial here against
@@ -44,7 +44,7 @@ public sealed class PlayerModeAutoEntry
     private readonly Func<bool> _isLiveInWorld;
     private readonly Func<bool> _isPlayerEntityPresent;
     private readonly Func<bool> _isPlayerControllerReady;
-    private readonly Func<bool> _isSpawnGroundReady;
+    private readonly Func<bool> _isWorldReady;
     private readonly Action     _enterPlayerMode;
 
     private bool _armed;
@@ -62,12 +62,10 @@ public sealed class PlayerModeAutoEntry
     /// PlayerMovementController is set up. Stays true once player mode
     /// is established; the auto-entry's job is to flip it from false
     /// to true exactly once.</param>
-    /// <param name="isSpawnGroundReady">True iff the terrain under the
-    /// player's spawn position has streamed into the physics engine.
-    /// #106 gate-2 (2026-06-09): entering player mode earlier integrates
-    /// gravity against an empty world and free-falls the player into the
-    /// void. Retail never has this state — it loads cells synchronously;
-    /// this hold is the async-streaming equivalent of that invariant.</param>
+    /// <param name="isWorldReady">True iff the player's destination is
+    /// complete across render publication, composite textures, and collision.
+    /// Retail keeps position completion behind one blocking cell-load edge;
+    /// acdream's asynchronous domains must converge before entry.</param>
     /// <param name="enterPlayerMode">Action invoked on the firing
     /// tick. The same routine the manual Tab handler invokes (fly →
     /// player transition). Must construct the controller + chase
@@ -77,13 +75,13 @@ public sealed class PlayerModeAutoEntry
         Func<bool> isLiveInWorld,
         Func<bool> isPlayerEntityPresent,
         Func<bool> isPlayerControllerReady,
-        Func<bool> isSpawnGroundReady,
+        Func<bool> isWorldReady,
         Action     enterPlayerMode)
     {
         _isLiveInWorld           = isLiveInWorld           ?? throw new ArgumentNullException(nameof(isLiveInWorld));
         _isPlayerEntityPresent   = isPlayerEntityPresent   ?? throw new ArgumentNullException(nameof(isPlayerEntityPresent));
         _isPlayerControllerReady = isPlayerControllerReady ?? throw new ArgumentNullException(nameof(isPlayerControllerReady));
-        _isSpawnGroundReady      = isSpawnGroundReady      ?? throw new ArgumentNullException(nameof(isSpawnGroundReady));
+        _isWorldReady            = isWorldReady            ?? throw new ArgumentNullException(nameof(isWorldReady));
         _enterPlayerMode         = enterPlayerMode         ?? throw new ArgumentNullException(nameof(enterPlayerMode));
     }
 
@@ -117,7 +115,7 @@ public sealed class PlayerModeAutoEntry
         if (!_isLiveInWorld()) return false;
         if (!_isPlayerEntityPresent()) return false;
         if (!_isPlayerControllerReady()) return false;
-        if (!_isSpawnGroundReady()) return false;
+        if (!_isWorldReady()) return false;
 
         _armed = false;
         _enterPlayerMode();