Checkpoint web parity through Chromium input tasks

web/protocol/glb-loss-report.ts

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+import type { GLBExportReport } from "./glb-export";
+import type { SceneSnapshotIR } from "./scene-ir";
+
+export const GLB_LOSS_REPORT_SCHEMA_VERSION = 1 as const;
+
+export interface GLBLossReport {
+  schemaVersion: typeof GLB_LOSS_REPORT_SCHEMA_VERSION;
+  operation: "GLB_EXPORT_LOSS_REPORT";
+  sceneId: string;
+  sourceRevision: number;
+  canExport: boolean;
+  errorCount: number;
+  warningCount: number;
+  losses: Array<{
+    code: string;
+    severity: "warning" | "error";
+    message: string;
+    id: string | null;
+  }>;
+  surface: {
+    nodeCount: number;
+    meshCount: number;
+    materialCount: number;
+    imageCount: number;
+    animationCount: number;
+    nonMeshCount: number;
+  };
+}
+
+/** Convert the exporter result into a stable, machine-consumable loss report. */
+export function createGLBLossReport(snapshot: SceneSnapshotIR, report: GLBExportReport): GLBLossReport {
+  const losses = report.warnings
+    .map((warning) => ({
+      code: warning.code,
+      severity: warning.severity,
+      message: warning.message,
+      id: warning.id ?? null,
+    }))
+    .sort((left, right) =>
+      left.code.localeCompare(right.code) ||
+      left.severity.localeCompare(right.severity) ||
+      (left.id ?? "").localeCompare(right.id ?? "") ||
+      left.message.localeCompare(right.message),
+    );
+  return {
+    schemaVersion: GLB_LOSS_REPORT_SCHEMA_VERSION,
+    operation: "GLB_EXPORT_LOSS_REPORT",
+    sceneId: snapshot.sceneId,
+    sourceRevision: snapshot.revision,
+    canExport: report.canExport,
+    errorCount: losses.filter((loss) => loss.severity === "error").length,
+    warningCount: losses.filter((loss) => loss.severity === "warning").length,
+    losses,
+    surface: {
+      nodeCount: snapshot.nodes.length,
+      meshCount: snapshot.meshes.length,
+      materialCount: snapshot.materials.length,
+      imageCount: snapshot.images.length,
+      animationCount: snapshot.animations.length,
+      nonMeshCount: snapshot.nonMeshData?.length ?? 0,
+    },
+  };
+}