feat(web): switch to implementation-first capability wave

web/protocol/render-compositor-commands.ts

@@ -0,0 +1,14 @@
+import type { RenderCapabilityRequest } from "./render-capabilities";
+
+/** Canonical capability requests shared by export and future compositor UI. */
+export const renderCompositorCommands = Object.freeze({
+  boundedShaderGraph(): RenderCapabilityRequest {
+    return { kind: "ARBITRARY_SHADER", nodeTypes: ["PRINCIPLED", "MATERIAL_OUTPUT"] };
+  },
+  webGPUBackend(): RenderCapabilityRequest {
+    return { kind: "WEBGPU_BACKEND" };
+  },
+  postProcess(passes: Extract<RenderCapabilityRequest, { kind: "POSTPROCESS" }>["passes"]): RenderCapabilityRequest {
+    return { kind: "POSTPROCESS", passes: [...passes] };
+  },
+} as const);