Phase 5 step 5

apps/LoopThroughWithOpenGLCompositing/runtime/snapshot/RenderSnapshotBuilder.cpp

@@ -89,7 +89,7 @@ bool RenderSnapshotBuilder::TryBuildLayerRenderStates(unsigned outputWidth, unsi
 
 bool RenderSnapshotBuilder::TryRefreshLayerParameters(std::vector<RuntimeRenderState>& states) const
 {
-	RefreshLayerParameters(mRuntimeStore.CopyLayerStates(), states);
+	RefreshLayerParameters(mRuntimeStore.CopyCommittedLiveLayerStates(), states);
 	return true;
 }
 
@@ -113,10 +113,10 @@ void RenderSnapshotBuilder::BuildLayerRenderStates(unsigned outputWidth, unsigne
 {
 	states.clear();
 
-	for (const LayerStackStore::LayerPersistentState& layer : readModel.layers)
+	for (const LayerStackStore::LayerPersistentState& layer : readModel.committedLiveState.layers)
 	{
-		auto shaderIt = readModel.packagesById.find(layer.shaderId);
+		auto shaderIt = readModel.committedLiveState.packagesById.find(layer.shaderId);
-		if (shaderIt == readModel.packagesById.end())
+		if (shaderIt == readModel.committedLiveState.packagesById.end())
 			continue;
 		const ShaderPackage& shaderPackage = shaderIt->second;
 

apps/LoopThroughWithOpenGLCompositing/runtime/store/RuntimeStore.cpp

@@ -576,24 +576,37 @@ ShaderCompilerInputs RuntimeStore::GetShaderCompilerInputs() const
 	return inputs;
 }
 
+CommittedLiveStateReadModel RuntimeStore::BuildCommittedLiveStateReadModel() const
+{
+	CommittedLiveStateReadModel model;
+	std::lock_guard<std::mutex> lock(mMutex);
+	model.layers = mLayerStack.Layers();
+	model.packagesById = mShaderCatalog.CaptureSnapshot().packagesById;
+	return model;
+}
+
 RenderSnapshotReadModel RuntimeStore::BuildRenderSnapshotReadModel() const
 {
 	RenderSnapshotReadModel model;
 	model.signalStatus = mHealthTelemetry.GetSignalStatusSnapshot();
+	model.committedLiveState = BuildCommittedLiveStateReadModel();
 	std::lock_guard<std::mutex> lock(mMutex);
-	model.layers = mLayerStack.Layers();
-	model.packagesById = mShaderCatalog.CaptureSnapshot().packagesById;
 	model.timing.startTime = mStartTime;
 	model.timing.startupRandom = mStartupRandom;
 	return model;
 }
 
-std::vector<RuntimeStore::LayerPersistentState> RuntimeStore::CopyLayerStates() const
+std::vector<RuntimeStore::LayerPersistentState> RuntimeStore::CopyCommittedLiveLayerStates() const
 {
 	std::lock_guard<std::mutex> lock(mMutex);
 	return mLayerStack.Layers();
 }
 
+std::vector<RuntimeStore::LayerPersistentState> RuntimeStore::CopyLayerStates() const
+{
+	return CopyCommittedLiveLayerStates();
+}
+
 RenderTimingSnapshot RuntimeStore::GetRenderTimingSnapshot() const
 {
 	std::lock_guard<std::mutex> lock(mMutex);

apps/LoopThroughWithOpenGLCompositing/runtime/store/RuntimeStore.h

@@ -71,7 +71,9 @@ public:
 	void ClearReloadRequest();
 	bool CopyShaderPackageForStoredLayer(const std::string& layerId, ShaderPackage& shaderPackage, std::string& error) const;
 	::ShaderCompilerInputs GetShaderCompilerInputs() const;
+	::CommittedLiveStateReadModel BuildCommittedLiveStateReadModel() const;
 	::RenderSnapshotReadModel BuildRenderSnapshotReadModel() const;
+	std::vector<LayerPersistentState> CopyCommittedLiveLayerStates() const;
 	std::vector<LayerPersistentState> CopyLayerStates() const;
 	::RenderTimingSnapshot GetRenderTimingSnapshot() const;
 	::RuntimeStatePresentationReadModel BuildRuntimeStatePresentationReadModel() const;

apps/LoopThroughWithOpenGLCompositing/runtime/store/RuntimeStoreReadModels.h

@@ -27,10 +27,15 @@ struct RenderTimingSnapshot
 	double startupRandom = 0.0;
 };
 
-struct RenderSnapshotReadModel
+struct CommittedLiveStateReadModel
 {
 	std::vector<LayerStackStore::LayerPersistentState> layers;
 	std::map<std::string, ShaderPackage> packagesById;
+};
+
+struct RenderSnapshotReadModel
+{
+	CommittedLiveStateReadModel committedLiveState;
 	HealthTelemetry::SignalStatusSnapshot signalStatus;
 	RenderTimingSnapshot timing;
 };

docs/PHASE_5_LIVE_STATE_LAYERING_DESIGN.md

@@ -7,8 +7,8 @@ Phase 1 named the subsystems. Phase 2 added the typed event substrate. Phase 3 m
 ## Status
 
 - Phase 5 design package: proposed.
-- Phase 5 implementation: Step 4 complete.
+- Phase 5 implementation: Step 5 complete.
-- Current alignment: Phase 3 introduced the first pure composition boundary and transient OSC overlay owner. Phase 5 now has a small `RuntimeStateLayerModel` inventory that names the current state categories, `RenderStateComposer` consumes a `LayeredRenderStateInput` whose fields make base persisted, committed live, and transient automation inputs explicit, `RuntimeLiveState` owns transient-overlay invalidation against current layer/parameter compatibility, and settled OSC commits have an explicit session-only persistence policy. Committed runtime values are still physically stored through `RuntimeStore`/`LayerStackStore`.
+- Current alignment: Phase 3 introduced the first pure composition boundary and transient OSC overlay owner. Phase 5 now has a small `RuntimeStateLayerModel` inventory that names the current state categories, `RenderStateComposer` consumes a `LayeredRenderStateInput` whose fields make base persisted, committed live, and transient automation inputs explicit, `RuntimeLiveState` owns transient-overlay invalidation against current layer/parameter compatibility, settled OSC commits have an explicit session-only persistence policy, and snapshot publication consumes a named `CommittedLiveStateReadModel`. Committed runtime values are still physically backed by `RuntimeStore`/`LayerStackStore` during this conservative migration step.
 
 Current live-state footholds:
 
@@ -21,6 +21,7 @@ Current live-state footholds:
 - `RuntimeStateLayerModel` names the Phase 5 state categories and classifies current fields as base persisted, committed live, transient automation, render-local, or health/config state.
 - `RuntimeCoordinator` can request layer-scoped transient OSC invalidation, while `RuntimeLiveState` prunes overlays that no longer map to the current render-facing layer/parameter definitions.
 - `RuntimeCoordinator::CommitOscParameterByControlKey(...)` commits settled OSC values into session state without requesting persistence by default.
+- `CommittedLiveStateReadModel` names the current committed/session read boundary that feeds render snapshot publication while remaining physically backed by `RuntimeStore`.
 
 ## Why Phase 5 Exists
 
@@ -310,9 +311,9 @@ Decide whether to physically split committed-live state now or introduce a read/
 
 Conservative option:
 
-- leave storage physically in `RuntimeStore`
+- [x] leave storage physically in `RuntimeStore`
-- add a named committed-live read model
+- [x] add a named committed-live read model
-- keep persistence decisions in `RuntimeCoordinator`
+- [x] keep persistence decisions in `RuntimeCoordinator`
 
 Stronger option:
 
@@ -322,6 +323,13 @@ Stronger option:
 
 Phase 5 does not need a flag-day split. It needs the concept to stop being implicit.
 
+Current implementation:
+
+- `CommittedLiveStateReadModel` carries the current committed/session layer stack and shader package metadata used by snapshot publication.
+- `RenderSnapshotReadModel` contains `committedLiveState` rather than exposing layer-stack fields directly.
+- `RenderSnapshotBuilder` builds render snapshots and parameter refreshes from committed-live read APIs.
+- `RuntimeStore` still provides the physical backing during this phase, but session-only committed changes can be observed through the committed-live read model without requiring durable persistence.
+
 ### Step 6. Update Docs And Exit Criteria
 
 Before calling Phase 5 complete, update:
@@ -388,7 +396,7 @@ Phase 5 can be considered complete once the project can say:
 - [x] `RenderStateComposer` or its replacement consumes a layered input contract
 - [x] reset/reload/preset behavior for transient overlays is centralized or clearly delegated
 - [x] OSC overlay settle/commit behavior is explicit, including persistence policy
-- [ ] `RuntimeStore` remains durable-state focused and does not absorb transient automation policy
+- [x] `RuntimeStore` remains durable-state focused and does not absorb transient automation policy
 - [ ] render-local temporal/feedback state remains separate from live parameter layering
 - [ ] subsystem docs and the architecture review reflect the final ownership model
 

docs/subsystems/RenderEngine.md

@@ -113,6 +113,8 @@ Phase 5's `RuntimeStateLayerModel` explicitly keeps temporal history, feedback s
 
 `RuntimeLiveState` now owns transient automation invalidation for render-facing compatibility. It can clear overlays for a target layer/control key and prunes overlays that no longer resolve to the current layer and parameter definitions before applying them to a frame. This keeps shader reload, preset load, and layer removal behavior local to the live-state/composition boundary instead of scattering it through GL drawing code.
 
+Render snapshots now flow through a named `CommittedLiveStateReadModel`, so render-facing committed state is distinct from durable storage even while both are physically backed by the same store during migration.
+
 ### 5. Shader Build Application
 
 Compilation itself may eventually move into a separate build service, but once shader build outputs exist, `RenderEngine` owns:

docs/subsystems/RuntimeCoordinator.md

@@ -274,6 +274,8 @@ For OSC specifically, the coordinator should eventually decide:
 
 Phase 5 sets the default settled OSC policy to session-only. `CommitOscParameterByControlKey(...)` updates committed session state through the store with persistence disabled, publishes ordinary mutation/state-change observations, and does not request a persistence write unless a future explicit policy opts into durable OSC commits.
 
+The committed-live concept now has a named read model, `CommittedLiveStateReadModel`. The coordinator remains the owner of whether a mutation should be durable or session-only, while `RuntimeStore` temporarily backs the read model until a physical `CommittedLiveState` collaborator is worth extracting.
+
 ### Health and timing state
 
 The coordinator may emit events like:

docs/subsystems/RuntimeStore.md

@@ -97,6 +97,8 @@ Those are coordinator concerns, not store concerns.
 
 Phase 5 names this boundary in code through `RuntimeStateLayerModel`: persisted layer stack data, saved parameter values, and stack presets are classified as base persisted state. Operator/session values may still be backed by the store during migration, but their mutation policy is committed-live policy owned by the coordinator, not durable-store policy by default.
 
+Phase 5 also adds `CommittedLiveStateReadModel` as the named read boundary for current session/operator state. During the conservative migration, `RuntimeStore` still backs that model physically, but snapshot publication consumes the committed-live read model rather than treating render-facing state as raw durable storage.
+
 ### Runtime Configuration
 
 Examples:

tests/RuntimeSubsystemTests.cpp

@@ -9,6 +9,7 @@
 #include <filesystem>
 #include <fstream>
 #include <iostream>
+#include <map>
 #include <string>
 #include <variant>
 #include <windows.h>
@@ -323,6 +324,22 @@ void TestRuntimeCoordinatorPersistenceEvents()
 		Expect(!oscCommitSnapshot.currentValue.numberValues.empty() &&
 				oscCommitSnapshot.currentValue.numberValues[0] == 0.2,
 			"settled OSC commit updates the committed session value");
+
+		CommittedLiveStateReadModel committedLiveState = store.BuildCommittedLiveStateReadModel();
+		Expect(!committedLiveState.layers.empty(), "committed live read model exposes current session layers");
+		const auto committedLayerIt = std::find_if(committedLiveState.layers.begin(), committedLiveState.layers.end(),
+			[&oscCommitSnapshot](const RuntimeStore::LayerPersistentState& layer) { return layer.id == oscCommitSnapshot.layerId; });
+		Expect(committedLayerIt != committedLiveState.layers.end(), "committed live read model preserves layer identity");
+		if (committedLayerIt != committedLiveState.layers.end())
+		{
+			const auto committedValueIt = committedLayerIt->parameterValues.find("gain");
+			Expect(committedValueIt != committedLayerIt->parameterValues.end() &&
+					!committedValueIt->second.numberValues.empty() &&
+					committedValueIt->second.numberValues[0] == 0.2,
+				"committed live read model includes session-only OSC commit value");
+		}
+		Expect(committedLiveState.packagesById.find("alpha") != committedLiveState.packagesById.end(),
+			"committed live read model carries package definitions for snapshot publication");
 	}
 
 	std::filesystem::remove_all(root);