feat(ui): AD-109 — arm the login wormhole at the char-select Enter click

USER-DIRECTED deviation from retail (register row AD-109, same commit):
retail presents the empty pre-player gameplay screen — black behind the
retained UI — from the Enter click (CPlayerSystem::LogOnCharacter
@0x0055F890 -> CM_Login::SendNotice_BeginEnterWorld @0x006AD810, UI mode
0x10000008) until CreatePlayer raises SmartBox::teleport_in_progress
@0x00451C20 and gmSmartBoxUI::UseTime @0x004D6EAB begins TAS_TUNNEL. The
user prefers the tunnel to cover that whole wait.

- ILocalPlayerTeleportNetworkSink.ArmLoginTunnel: begins the login
  wormhole presentation at the Enter click, consuming the sequencer's
  begin-edge events SYNCHRONOUSLY (the Enter command blocks the update
  thread for the whole ServerReady round trip, so a deferred first tick
  would leave exactly the black window this deviation removes). The
  enter cue plays at the click: retail's own rule is cue-at-animation-
  begin (Sound_UI_EnterPortal @0x004D638E, unconditional inside
  BeginTeleportAnimation), and the animation begin moved to the click.
- Armed pre-reveal pump: tunnel animates across the round trip
  (worldReady pinned false, sequencer holds in Tunnel); the hold clock
  accumulates from the click.
- Adoption: the Runtime login reveal ADOPTS the running presentation
  (no re-Begin, no second cue); rejected EnterWorld (lifecycle back to
  AwaitingSelection) disarms and retires the tunnel.
- Wired at the ONE host edge every entry route shares:
  ILiveSessionLifecycleHost.ApplySelectedCharacter (direct connect,
  roster Enter, enter-after-create) via
  LiveSessionSelectionBindings.ArmLoginTunnel (default no-op keeps
  headless and every existing construction site unchanged).
- ILocalPlayerLoginLifecycleSource: typed seam (not a stored delegate —
  the frame-phase owner delegate-field guard) projecting the Runtime
  character-selection lifecycle for the disarm edge.
- Frame contract update: [login-frames] over a login is tunnel -> world
  from the click — no void, and no black between click and world.

Tests: 4 new armed-tunnel tests (arm/adopt/disarm/frame-shape); App
suite live-DAT 5516 passed / 3 skipped (baseline 5512/3 + 4 new).

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

src/AcDream.App/Rendering/LoginPresentationFrameProbe.cs

@@ -15,9 +15,14 @@ internal static class RenderPresentationDiagnostics
     /// classification for the login wormhole edges. When set, every completed
     /// render frame is classified by WHAT PRESENTED — <c>world</c> /
     /// <c>tunnel</c> / <c>black</c> / <c>void</c> — and a <c>[login-frames]</c>
-    /// line is written on every classification transition. The gate contract
-    /// is retail's: the sequence over a login must contain NO <c>void</c>
-    /// entry on either edge (black → tunnel → world, each swap atomic).
+    /// line is written on every classification transition. The gate contract:
+    /// the sequence over a login must contain NO <c>void</c> entry on either
+    /// edge, and — since the enter-click round's click-armed tunnel
+    /// (registered deviation from retail's pre-CreatePlayer black) — no
+    /// <c>black</c> entry between the Enter click and the world either: the
+    /// sequence from the click is tunnel → world, each swap atomic.
+    /// (<c>black</c> remains legal BEFORE the click — it is the
+    /// character-select screen's own backdrop.)
     /// Not a user setting; not in <c>RuntimeOptions</c>; not persisted.
     /// </summary>
     public static bool ProbeLoginFrames { get; } =

src/AcDream.App/Rendering/RenderFrameResourceController.cs

@@ -160,8 +160,18 @@ internal sealed class LocalPlayerTeleportRenderStateSource
     /// backdrop had no retail counterpart and presented as the gate's
     /// entry-edge VOID (2026-08-17). Both flags flip on the update thread
     /// (the login activation tick flips ChaseModeEverEntered AND makes the
-    /// tunnel visible before the next render), so the black → tunnel → world
+    /// tunnel visible before the next render), so the cover → tunnel → world
     /// sequence swaps atomically per frame.
+    ///
+    /// <para>
+    /// Enter-click round (2026-08-17): with the click-armed login tunnel
+    /// (registered user-directed deviation — see
+    /// <c>ILocalPlayerTeleportNetworkSink.ArmLoginTunnel</c>) the tunnel
+    /// scene becomes visible AT the Enter click, so retail's bare-black
+    /// CreatePlayer window normally never presents; the second arm remains
+    /// the char-select backdrop and the fallback for any unarmed pre-world
+    /// frame.
+    /// </para>
     /// </summary>
     public bool IsPortalViewportVisible =>
         _teleport.IsPortalViewportVisible || _login.IsWaitingForLogin;