Move surface contracts to model

docs/PROJECT-STRUCTURE.md

@@ -175,6 +175,8 @@ retained graphics without making `Model` depend on `Hosting`.
 `engine/Age.Engine/Model/RgbaImage.cs` owns the format-independent packed RGBA image transported between SYS4
 decoders, host surfaces, renderers, persistence, and tests; consumers do not depend on `Sys4` merely to exchange
 decoded pixels.
+`engine/Age.Engine/Model/SurfaceContracts.cs` owns neutral surface fill/copy requests and the black-fade direction
+shared by VM presentation, graphics hosts, Godot, and tests.
 
 `engine/Age.Engine/Model/GfxState.cs` retains cross-domain retained-graphics coordination.
 `engine/Age.Engine/Model/GfxState.Contracts.cs` owns its public render, transition, diagnostic, persistence,

docs/remake-architecture-and-roadmap.md

@@ -793,6 +793,11 @@ do not mix mechanical moves with semantic changes.
    direction remain in their prior locations pending a separate transport cleanup. Runtime validation remains
    green.
 
+   The seventh bounded contract slice moved the unchanged `SurfaceRectFill`, `SurfaceRectCopy`, and
+   `SurfaceBlackFadeDirection` declarations from `Hosting` into `Model/SurfaceContracts.cs`. Every consumer already
+   imported `Model`, so no call sites changed; surface request shape, enum values, and graphics behavior remain
+   unchanged. Runtime validation remains green.
+
 4. **Make the build graph express source ownership.** Stop linking production `.cs` files from `godot/` and
    `tools/movie-corpus-gate/` into `Age.Engine.Tests`. Extract the platform-neutral frontend/movie/diagnostic
    code into a small production project referenced by Godot, tests, and the corpus gate. Retain both existing
@@ -1154,7 +1159,8 @@ layer's rendering diverges from ADV; save layout.
 Continue step 3 of the **codebase consolidation** maintenance slice: clarify runtime contracts without changing
 behavior or the aggregate host accepted by the VM. With diagnostic, lifecycle, audio, and movie contracts
 established beneath `IHost`, shared movie/image transport neutral, and the graphics contract now separated, move
-the unchanged `SurfaceRectFill`, `SurfaceRectCopy`, and `SurfaceBlackFadeDirection` contracts from `Hosting` to
+the input host contract next: modal text entry, ADV waits and callback servicing, input clock, cursor resources,
-`Model` next. Preserve all consumers and graphics behavior before separating the remaining ADV/input domains.
+and skip-state interaction. Preserve the existing overload/default chains and aggregate `IHost` entry point before
+separating the remaining ADV text/presentation contract.
 Concrete playthrough blockers may still preempt this bounded maintenance work; the consolidation effort does
 not replace Phase B gameplay validation or the open cross-platform gates.

engine/Age.Engine/Hosting/IHost.cs

@@ -20,13 +20,6 @@ public readonly record struct AdvWaitIndicatorConfig(
 public readonly record struct AdvAutoWaitState(
     bool Enabled, bool VoicePending, long PostVoiceDelayMs, long UnvoicedDelayMs);
 
-public readonly record struct SurfaceRectFill(
-    int SurfaceSlot, int X, int Y, int Width, int Height, int Alpha, long Rgb);
-
-public readonly record struct SurfaceRectCopy(
-    int SourceSurface, int DestinationSurface, int SourceX, int SourceY,
-    int Width, int Height, int DestinationX, int DestinationY);
-
 /// <summary>A synchronous AGE-owned diagnostic prompt after native body/context formatting.</summary>
 public readonly record struct DiagnosticMessage(string Caption, string Text);
 
@@ -34,12 +27,6 @@ public readonly record struct DiagnosticMessage(string Caption, string Text);
 public readonly record struct FullwidthTextEditRequest(string CurrentText, string InitialText);
 public readonly record struct FullwidthTextEditResult(bool Accepted, string Text);
 
-public enum SurfaceBlackFadeDirection
-{
-    FromBlack,
-    ToBlack,
-}
-
 public interface IHost : IDiagnosticHost, ILifecycleHost, IAudioHost, IMovieHost, IGraphicsHost
 {
     /// <summary>Present AGERc's modal full-width editor. Cancel preserves CurrentText.</summary>

engine/Age.Engine/Model/SurfaceContracts.cs

@@ -0,0 +1,14 @@
+namespace Age.Engine.Model;
+
+public readonly record struct SurfaceRectFill(
+    int SurfaceSlot, int X, int Y, int Width, int Height, int Alpha, long Rgb);
+
+public readonly record struct SurfaceRectCopy(
+    int SourceSurface, int DestinationSurface, int SourceX, int SourceY,
+    int Width, int Height, int DestinationX, int DestinationY);
+
+public enum SurfaceBlackFadeDirection
+{
+    FromBlack,
+    ToBlack,
+}