Specify reactive entity SoA world lowering

docs/world-state-lowering.md

@@ -76,6 +76,25 @@ World surfaces should be able to describe:
 The renderer chooses the best native projection it can support. It must not
 invent provider semantics to compensate for missing contract information.
 
+### Entity SoA Views
+
+`gamecult.eve.entity_soa_view.v1` is the portable descriptor for hot entity
+presentation state. A `world.scene2d` or `world.scene3d` component points to it
+with `entityViewPointerId`; `entityViewSchema` names the schema. The surface
+does not duplicate entity transforms as retained child components.
+
+The descriptor carries buffer locations, semantic columns, dirty ranges, and
+render groups. CultMesh selects the buffer route: shared memory for co-located
+runtimes, a native stream for remote runtimes, or another advertised backend.
+Replacing the reactive descriptor publishes a new generation and lowerers apply
+only its dirty ranges. A backend location is transport data, not provider
+authority.
+
+Stable composition, commands, and binding declarations may arrive in a
+bootstrap snapshot. Live entity generations do not. UI values bind to reactive
+typed documents named by state pointers. Versioned asset manifests are
+bootstrap state and their content-addressed artifacts are cached.
+
 Provider advertisements attach the reusable boundary to world surfaces through
 `surfaces[].worldInteraction`. That block names:
 

schemas/gamecult.eve.entity_soa_view.v1.schema.json

@@ -0,0 +1,87 @@
+{
+  "$schema": "https://json-schema.org/draft/2020-12/schema",
+  "$id": "gamecult.eve.entity_soa_view.v1",
+  "title": "Eve Entity SoA View",
+  "type": "object",
+  "required": ["schema", "providerId", "viewId", "frameId", "generation", "backend", "synchronizationMode", "buffers", "columns", "dirtyRanges", "renderGroups"],
+  "properties": {
+    "schema": { "const": "gamecult.eve.entity_soa_view.v1" },
+    "providerId": { "type": "string", "minLength": 1 },
+    "viewId": { "type": "string", "minLength": 1 },
+    "frameId": { "type": "integer", "minimum": 0 },
+    "generation": { "type": "integer", "minimum": 0 },
+    "publishedAtUtc": { "type": "string" },
+    "backend": { "type": "string", "minLength": 1 },
+    "synchronizationMode": { "type": "string", "minLength": 1 },
+    "buffers": { "type": "array", "items": { "$ref": "#/$defs/buffer" } },
+    "columns": { "type": "array", "items": { "$ref": "#/$defs/column" } },
+    "dirtyRanges": { "type": "array", "items": { "$ref": "#/$defs/dirtyRange" } },
+    "renderGroups": { "type": "array", "items": { "$ref": "#/$defs/renderGroup" } }
+  },
+  "$defs": {
+    "buffer": {
+      "type": "object",
+      "required": ["bufferId", "backend", "location", "byteOffset", "byteLength", "generation"],
+      "properties": {
+        "bufferId": { "type": "string", "minLength": 1 },
+        "backend": { "type": "string", "minLength": 1 },
+        "location": { "type": "string", "minLength": 1 },
+        "byteOffset": { "type": "integer", "minimum": 0 },
+        "byteLength": { "type": "integer", "minimum": 0 },
+        "generation": { "type": "integer", "minimum": 0 }
+      },
+      "additionalProperties": false
+    },
+    "column": {
+      "type": "object",
+      "required": ["columnId", "semantic", "bufferId", "scalarType", "byteOffset", "elementStride", "elementCount"],
+      "properties": {
+        "columnId": { "type": "string", "minLength": 1 },
+        "semantic": { "type": "string", "minLength": 1 },
+        "bufferId": { "type": "string", "minLength": 1 },
+        "scalarType": { "type": "string", "minLength": 1 },
+        "byteOffset": { "type": "integer", "minimum": 0 },
+        "elementStride": { "type": "integer", "minimum": 1 },
+        "elementCount": { "type": "integer", "minimum": 0 },
+        "unit": { "type": "string" },
+        "coordinateSpace": { "type": "string" }
+      },
+      "additionalProperties": false
+    },
+    "dirtyRange": {
+      "type": "object",
+      "required": ["columnId", "startIndex", "count", "generation"],
+      "properties": {
+        "columnId": { "type": "string", "minLength": 1 },
+        "startIndex": { "type": "integer", "minimum": 0 },
+        "count": { "type": "integer", "minimum": 0 },
+        "generation": { "type": "integer", "minimum": 0 }
+      },
+      "additionalProperties": false
+    },
+    "renderGroup": {
+      "type": "object",
+      "required": ["groupId", "meshAssetRef", "materialAssetRef", "instanceCount", "defaultScale"],
+      "properties": {
+        "groupId": { "type": "integer", "minimum": 0 },
+        "meshAssetRef": { "type": "string" },
+        "materialAssetRef": { "type": "string" },
+        "subMeshIndex": { "type": "integer", "minimum": 0 },
+        "layer": { "type": "integer" },
+        "instanceCount": { "type": "integer", "minimum": 0 },
+        "defaultScale": { "type": "number" },
+        "boundsCenterX": { "type": "number" },
+        "boundsCenterY": { "type": "number" },
+        "boundsCenterZ": { "type": "number" },
+        "boundsSizeX": { "type": "number", "minimum": 0 },
+        "boundsSizeY": { "type": "number", "minimum": 0 },
+        "boundsSizeZ": { "type": "number", "minimum": 0 },
+        "shadowMode": { "type": "string" },
+        "receiveShadows": { "type": "boolean" },
+        "lod": { "type": "integer" }
+      },
+      "additionalProperties": false
+    }
+  },
+  "additionalProperties": false
+}