Checkpoint web parity through Chromium input tasks

tools/web/generate-stl-edge-fixtures.mjs

@@ -0,0 +1,36 @@
+import crypto from "node:crypto";
+import fs from "node:fs";
+import path from "node:path";
+import { fileURLToPath } from "node:url";
+
+const root = path.resolve(path.dirname(fileURLToPath(import.meta.url)), "../..");
+const sourcePath = path.join(root, "tests/files/web/m12_stl_capability_v1/capability-binary.stl");
+const outputRoot = path.join(root, "tests/files/web/m12_stl_edges_v1");
+const reportPath = path.join(root, "tests/golden/M12-07E/edge-fixtures.json");
+const sha256 = (bytes) => crypto.createHash("sha256").update(bytes).digest("hex");
+
+fs.mkdirSync(outputRoot, { recursive: true });
+fs.mkdirSync(path.dirname(reportPath), { recursive: true });
+const source = fs.readFileSync(sourcePath);
+if (source.length !== 184 || source.readUInt32LE(80) !== 2) throw new Error("M12-07D binary parent fixture drifted");
+fs.writeFileSync(path.join(outputRoot, "capability-binary.stl"), source);
+const degenerate = Buffer.from(source);
+const firstVertex = Buffer.from(degenerate.subarray(84 + 12, 84 + 24));
+firstVertex.copy(degenerate, 84 + 24);
+firstVertex.copy(degenerate, 84 + 36);
+const trailing = Buffer.concat([source, Buffer.from([0xde, 0xad, 0xbe, 0xef])]);
+const outputs = [
+  { id: "DEGENERATE_TRIANGLE", name: "degenerate-binary.stl", bytes: degenerate, expectedCode: "STL_DEGENERATE_TRIANGLE" },
+  { id: "TRAILING_BYTES", name: "trailing-binary.stl", bytes: trailing, expectedCode: "STL_TRAILING_BYTES" },
+];
+for (const output of outputs) fs.writeFileSync(path.join(outputRoot, output.name), output.bytes);
+const report = {
+  schemaVersion: 1,
+  task: "M12-07E",
+  operation: "STL_EDGE_FIXTURE_GENERATION",
+  parent: { path: "tests/files/web/m12_stl_capability_v1/capability-binary.stl", byteLength: source.length, sha256: sha256(source) },
+  fixtures: outputs.map((output) => ({ id: output.id, file: output.name, byteLength: output.bytes.length, sha256: sha256(output.bytes), expectedCode: output.expectedCode })),
+  nextTask: "M12-07F",
+};
+fs.writeFileSync(reportPath, JSON.stringify(report, null, 2) + "\n");
+process.stdout.write(`stl-edge-fixtures-generated cases=${outputs.length} next=${report.nextTask}\n`);