diff --git a/docs/PROJECT-STRUCTURE.md b/docs/PROJECT-STRUCTURE.md
index b897687..5f499e3 100644
--- a/docs/PROJECT-STRUCTURE.md
+++ b/docs/PROJECT-STRUCTURE.md
@@ -106,7 +106,7 @@ S:\Game Hacking\Eushully\Himegari\ ← workspace root (three siblings)
│ ├── opcodes.json GENERATED from opcodes.toml (machine view for the C# VM)
│ └── manifest.json, opcode-coverage.md (opcode-coverage.md GENERATED from opcodes.toml)
│
- ├── engine/ DELIVERABLE — the .NET VM core (AgeEngine.sln: Age.Engine / Age.Cli / tests)
+ ├── engine/ DELIVERABLE — the .NET VM/runtime projects and tests (AgeEngine.sln)
│ ├── Age.Engine/Model/ retained graphics state plus separately navigable public
│ render, transition, diagnostic, and persistence contracts
│ ├── Age.Engine/Sys4/ runtime game-root selection, catalog parser, loose-first bounded
@@ -118,6 +118,9 @@ S:\Game Hacking\Eushully\Himegari\ ← workspace root (three siblings)
│ ├── Age.Engine/Persistence/ native S3SD/S4SD + S3RT codecs, shared payload/ReadTextDB,
│ layout-3 numbered state/history/gfx, DAT/STH pair + BMP codec,
│ and profile-owned state
+ │ ├── Age.Engine.Frontend/ platform-neutral frontend diagnostics/options project: page
+ │ locator, timeline/trace/step-limit diagnostics, VM/window launch
+ │ options, and performance-frame logging
│ └── Age.Engine.Text.Windows/ optional exact Windows GDI gray-4 reference backend; kept
│ outside the platform-neutral VM/runtime core
├── native/ authored native runtime boundaries
@@ -147,6 +150,13 @@ surface-transition drawing, raster helpers, and compositor decision logging. `go
Godot input routing, locator/debug hotkeys, debug-scene dispatch, cursor control, native alerts, and
full-width text entry.
+`engine/Age.Engine.Frontend/` is the production owner of frontend helpers that do not depend on Godot types.
+Both `engine/AgeEngine.sln` and `godot/Himegari.sln` include the project; Godot and `Age.Engine.Tests` consume it
+through project references rather than compiling duplicate linked sources. The first owned cluster contains
+`PageLocatorState`, `GodotTimelineLog`, `GodotTraceSink`, `StepLimitDiagnosticFormatter`, `GodotVmOptions`,
+`PerformanceFrameLog`, and `WindowLaunchOptions`. Movie runtime/decoder helpers remain under `godot/` until their
+separate ownership slices.
+
`godot/GodotAdvHost.cs` retains cross-domain host coordination. Its partial-class companion
`godot/GodotAdvHost.AdvText.cs` owns live/retained ADV text, surface glyph rasterization and caching,
history presentation, message-window alpha, and retained wait-indicator configuration/publication.
diff --git a/docs/remake-architecture-and-roadmap.md b/docs/remake-architecture-and-roadmap.md
index d9e9aca..a99f51d 100644
--- a/docs/remake-architecture-and-roadmap.md
+++ b/docs/remake-architecture-and-roadmap.md
@@ -827,6 +827,13 @@ do not mix mechanical moves with semantic changes.
code into a small production project referenced by Godot, tests, and the corpus gate. Retain both existing
solution files because Godot export requires the frontend-local solution.
+ **Progress (2026-08-03):** the first bounded build-graph slice introduced the platform-neutral
+ `Age.Engine.Frontend` production project and added it to both existing solutions. Page locator, timeline/trace
+ and step-limit diagnostics, VM/window launch options, and performance-frame logging moved unchanged from
+ `godot/` into the new owner. Godot and `Age.Engine.Tests` now use project references, eliminating seven direct
+ test source links without changing public types, namespaces, behavior, or export configuration. Both solution
+ builds and runtime validation remain green.
+
5. **Close repository-policy and storage gaps.** Add an explicit project license, third-party notices and
checksums/provenance for committed binaries, consistent editor/build policy, a pinned .NET SDK, and a
CI entry point built on the same validation driver. Remove the empty workspace-root `.git` directory and
@@ -1181,8 +1188,9 @@ layer's rendering diverges from ADV; save layout.
## 8. Immediate next step
Begin step 4 of the **codebase consolidation** maintenance slice: make the build graph express source ownership
-without changing behavior. Introduce the production project boundary for platform-neutral frontend helpers now
-linked directly from `godot/` into `Age.Engine.Tests`, starting with the diagnostic/options helper cluster. Replace
-source links with project references while retaining both existing solution files and Godot export behavior.
+without changing behavior. Move the platform-neutral movie abstractions and runtime support—decoder interfaces,
+movie/audio runtime state, movie-surface registry, and RIFF sanitization—from `godot/` into
+`Age.Engine.Frontend` next. Replace their test source links while preserving the intentionally internal API through
+explicit friend-assembly access; leave FFmpeg interop/decoder ownership for the following slice.
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.
diff --git a/engine/Age.Engine.Frontend/Age.Engine.Frontend.csproj b/engine/Age.Engine.Frontend/Age.Engine.Frontend.csproj
new file mode 100644
index 0000000..017440a
--- /dev/null
+++ b/engine/Age.Engine.Frontend/Age.Engine.Frontend.csproj
@@ -0,0 +1,13 @@
+
+
+
+ net8.0
+ enable
+ enable
+
+
+
+
+
+
+
diff --git a/godot/GodotTimelineLog.cs b/engine/Age.Engine.Frontend/GodotTimelineLog.cs
similarity index 100%
rename from godot/GodotTimelineLog.cs
rename to engine/Age.Engine.Frontend/GodotTimelineLog.cs
diff --git a/godot/GodotTraceSink.cs b/engine/Age.Engine.Frontend/GodotTraceSink.cs
similarity index 100%
rename from godot/GodotTraceSink.cs
rename to engine/Age.Engine.Frontend/GodotTraceSink.cs
diff --git a/godot/GodotVmOptions.cs b/engine/Age.Engine.Frontend/GodotVmOptions.cs
similarity index 100%
rename from godot/GodotVmOptions.cs
rename to engine/Age.Engine.Frontend/GodotVmOptions.cs
diff --git a/godot/PageLocatorState.cs b/engine/Age.Engine.Frontend/PageLocatorState.cs
similarity index 100%
rename from godot/PageLocatorState.cs
rename to engine/Age.Engine.Frontend/PageLocatorState.cs
diff --git a/godot/PerformanceFrameLog.cs b/engine/Age.Engine.Frontend/PerformanceFrameLog.cs
similarity index 100%
rename from godot/PerformanceFrameLog.cs
rename to engine/Age.Engine.Frontend/PerformanceFrameLog.cs
diff --git a/godot/StepLimitDiagnosticFormatter.cs b/engine/Age.Engine.Frontend/StepLimitDiagnosticFormatter.cs
similarity index 100%
rename from godot/StepLimitDiagnosticFormatter.cs
rename to engine/Age.Engine.Frontend/StepLimitDiagnosticFormatter.cs
diff --git a/godot/WindowLaunchOptions.cs b/engine/Age.Engine.Frontend/WindowLaunchOptions.cs
similarity index 100%
rename from godot/WindowLaunchOptions.cs
rename to engine/Age.Engine.Frontend/WindowLaunchOptions.cs
diff --git a/engine/Age.Engine.Tests/Age.Engine.Tests.csproj b/engine/Age.Engine.Tests/Age.Engine.Tests.csproj
index 9bb7299..fe6bf19 100644
--- a/engine/Age.Engine.Tests/Age.Engine.Tests.csproj
+++ b/engine/Age.Engine.Tests/Age.Engine.Tests.csproj
@@ -22,21 +22,15 @@
+
-
-
-
-
-
-
-
diff --git a/engine/AgeEngine.sln b/engine/AgeEngine.sln
index aa049d0..523b022 100644
--- a/engine/AgeEngine.sln
+++ b/engine/AgeEngine.sln
@@ -3,9 +3,11 @@ Microsoft Visual Studio Solution File, Format Version 12.00
# Visual Studio Version 17
VisualStudioVersion = 17.0.31903.59
MinimumVisualStudioVersion = 10.0.40219.1
-Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Age.Engine", "Age.Engine\Age.Engine.csproj", "{DD04FB21-F83D-4547-BBEC-97295F30623A}"
-EndProject
-Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Age.Cli", "Age.Cli\Age.Cli.csproj", "{795573A0-A283-4A28-B26C-606C1AA5E1FE}"
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Age.Engine", "Age.Engine\Age.Engine.csproj", "{DD04FB21-F83D-4547-BBEC-97295F30623A}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Age.Engine.Frontend", "Age.Engine.Frontend\Age.Engine.Frontend.csproj", "{2B018D3E-4057-465E-89CB-4CC77FDD60E2}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Age.Cli", "Age.Cli\Age.Cli.csproj", "{795573A0-A283-4A28-B26C-606C1AA5E1FE}"
EndProject
Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Age.Engine.Tests", "Age.Engine.Tests\Age.Engine.Tests.csproj", "{2ED171C8-DA87-40FD-A6FB-3B3F6501029F}"
EndProject
@@ -22,8 +24,12 @@ Global
GlobalSection(ProjectConfigurationPlatforms) = postSolution
{DD04FB21-F83D-4547-BBEC-97295F30623A}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
{DD04FB21-F83D-4547-BBEC-97295F30623A}.Debug|Any CPU.Build.0 = Debug|Any CPU
- {DD04FB21-F83D-4547-BBEC-97295F30623A}.Release|Any CPU.ActiveCfg = Release|Any CPU
- {DD04FB21-F83D-4547-BBEC-97295F30623A}.Release|Any CPU.Build.0 = Release|Any CPU
+ {DD04FB21-F83D-4547-BBEC-97295F30623A}.Release|Any CPU.ActiveCfg = Release|Any CPU
+ {DD04FB21-F83D-4547-BBEC-97295F30623A}.Release|Any CPU.Build.0 = Release|Any CPU
+ {2B018D3E-4057-465E-89CB-4CC77FDD60E2}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+ {2B018D3E-4057-465E-89CB-4CC77FDD60E2}.Debug|Any CPU.Build.0 = Debug|Any CPU
+ {2B018D3E-4057-465E-89CB-4CC77FDD60E2}.Release|Any CPU.ActiveCfg = Release|Any CPU
+ {2B018D3E-4057-465E-89CB-4CC77FDD60E2}.Release|Any CPU.Build.0 = Release|Any CPU
{795573A0-A283-4A28-B26C-606C1AA5E1FE}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
{795573A0-A283-4A28-B26C-606C1AA5E1FE}.Debug|Any CPU.Build.0 = Debug|Any CPU
{795573A0-A283-4A28-B26C-606C1AA5E1FE}.Release|Any CPU.ActiveCfg = Release|Any CPU
diff --git a/godot/Himegari.csproj b/godot/Himegari.csproj
index 552e122..19a5bf6 100644
--- a/godot/Himegari.csproj
+++ b/godot/Himegari.csproj
@@ -13,6 +13,7 @@
+
diff --git a/godot/Himegari.sln b/godot/Himegari.sln
index 26a6079..afb98ed 100644
--- a/godot/Himegari.sln
+++ b/godot/Himegari.sln
@@ -5,6 +5,8 @@ VisualStudioVersion = 17.0.31903.59
MinimumVisualStudioVersion = 10.0.40219.1
Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Himegari", "Himegari.csproj", "{5821B505-EBD3-4B50-A83A-7AFE22AA1528}"
EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Age.Engine.Frontend", "..\engine\Age.Engine.Frontend\Age.Engine.Frontend.csproj", "{2B018D3E-4057-465E-89CB-4CC77FDD60E2}"
+EndProject
Global
GlobalSection(SolutionConfigurationPlatforms) = preSolution
Debug|Any CPU = Debug|Any CPU
@@ -21,5 +23,11 @@ Global
{5821B505-EBD3-4B50-A83A-7AFE22AA1528}.ExportDebug|Any CPU.Build.0 = ExportDebug|Any CPU
{5821B505-EBD3-4B50-A83A-7AFE22AA1528}.ExportRelease|Any CPU.ActiveCfg = ExportRelease|Any CPU
{5821B505-EBD3-4B50-A83A-7AFE22AA1528}.ExportRelease|Any CPU.Build.0 = ExportRelease|Any CPU
+ {2B018D3E-4057-465E-89CB-4CC77FDD60E2}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+ {2B018D3E-4057-465E-89CB-4CC77FDD60E2}.Debug|Any CPU.Build.0 = Debug|Any CPU
+ {2B018D3E-4057-465E-89CB-4CC77FDD60E2}.ExportDebug|Any CPU.ActiveCfg = Debug|Any CPU
+ {2B018D3E-4057-465E-89CB-4CC77FDD60E2}.ExportDebug|Any CPU.Build.0 = Debug|Any CPU
+ {2B018D3E-4057-465E-89CB-4CC77FDD60E2}.ExportRelease|Any CPU.ActiveCfg = Release|Any CPU
+ {2B018D3E-4057-465E-89CB-4CC77FDD60E2}.ExportRelease|Any CPU.Build.0 = Release|Any CPU
EndGlobalSection
EndGlobal