Set up DOTS + Netcode for Entities foundation

One-time stack setup per Docs/dots-setup-task.md (Unity 6.4.7 / 6000.4.7f1).
Packages: entities 6.4.0, entities.graphics 6.4.0, netcode 1.13.2, physics 1.4.6.

- Assets/_Project asmdef split: ProjectM.Simulation/Client/Server/Authoring (root ns ProjectM)
- GameBootstrap : ClientServerBootstrap; verified separate client + server worlds in Play Mode
- Gameplay subscene wired into SampleScene as a baking target
- Heartbeat component + Burst ISystem; EditMode smoke test green (1/1)
- In-repo Obsidian vault (Docs/Vault) incl. DR-001 (plain-Entities test over internal NetCodeTestWorld)
- Portable .mcp.json (basic-memory + serena via ${CLAUDE_PROJECT_DIR}); CLAUDE.md conventions
- .gitignore for DOTS baking cache + machine-local config

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Assets/Scenes/SampleScene.unity

@@ -38,12 +38,12 @@ RenderSettings:
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   m_Sun: {fileID: 0}
-  m_IndirectSpecularColor: {r: 0.18028378, g: 0.22571412, b: 0.30692285, a: 1}
   m_UseRadianceAmbientProbe: 0
 --- !u!157 &3
 LightmapSettings:
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-  serializedVersion: 12
+  serializedVersion: 13
+  m_BakeOnSceneLoad: 0
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@@ -248,14 +248,14 @@ MonoBehaviour:
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-  m_Version: 2
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-    frameInfluence: 0.1
-    jitterScale: 1
-    mipBias: 0
-    varianceClampScale: 0.9
-    contrastAdaptiveSharpening: 0
+    m_Quality: 3
+    m_FrameInfluence: 0.1
+    m_JitterScale: 1
+    m_MipBias: 0
+    m_VarianceClampScale: 0.9
+    m_ContrastAdaptiveSharpening: 0
+  m_Version: 2
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@@ -282,14 +282,14 @@ Light:
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   m_Range: 10
   m_SpotAngle: 30
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-  m_CookieSize: 10
+  m_CookieSize2D: {x: 10, y: 10}
   m_Shadows:
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     m_Resolution: -1
@@ -334,8 +334,11 @@ Light:
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   m_UseViewFrustumForShadowCasterCull: 1
   m_ForceVisible: 0
-  m_ShadowRadius: 0
+  m_ShapeRadius: 0
   m_ShadowAngle: 0
+  m_LightUnit: 1
+  m_LuxAtDistance: 1
+  m_EnableSpotReflector: 1
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-  m_ShadowRenderingLayers: 1
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   m_SoftShadowQuality: 1
+  m_RenderingLayersMask:
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+    m_Bits: 1
+  m_ShadowRenderingLayersMask:
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+    m_Bits: 1
+  m_Version: 4
+  m_LightLayerMask: 1
+  m_ShadowLayerMask: 1
+  m_RenderingLayers: 1
+  m_ShadowRenderingLayers: 1
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   m_Father: {fileID: 0}
   m_LocalEulerAnglesHint: {x: 0, y: 0, z: 0}
+--- !u!1 &1314640898
+GameObject:
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+  m_PrefabInstance: {fileID: 0}
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+  serializedVersion: 6
+  m_Component:
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+  m_Name: GameplaySubScene
+  m_TagString: Untagged
+  m_Icon: {fileID: 0}
+  m_NavMeshLayer: 0
+  m_StaticEditorFlags: 0
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+--- !u!114 &1314640899
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+  m_PrefabAsset: {fileID: 0}
+  m_GameObject: {fileID: 1314640898}
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+  m_EditorHideFlags: 0
+  m_Script: {fileID: 11500000, guid: 45a335734b1572644a6a5d09d87adc65, type: 3}
+  m_Name: 
+  m_EditorClassIdentifier: Unity.Scenes::Unity.Scenes.SubScene
+  _SceneAsset: {fileID: 102900000, guid: 9dc8ce2e486074792932d618c976e312, type: 3}
+  _HierarchyColor: {r: 0.5, g: 0.5, b: 0.5, a: 1}
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+  _SceneGUID:
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+      z: 2171413394
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 SceneRoots:
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   - {fileID: 410087041}
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