chore: import upstream snapshot with attribution

tests/unit/compression/eval-grader.test.ts

@@ -0,0 +1,22 @@
+import { describe, it } from "node:test";
+import assert from "node:assert/strict";
+import { buildGradePrompt, parseGradeVerdict } from "../../../open-sse/services/compression/eval/grader.ts";
+
+describe("gold grader", () => {
+  it("buildGradePrompt embeds the answer and the gold", () => {
+    const msgs = buildGradePrompt("returns three", "3");
+    const joined = msgs.map((m) => m.content).join("\n");
+    assert.match(joined, /returns three/);
+    assert.match(joined, /3/);
+    assert.match(joined.toUpperCase(), /CORRECT|INCORRECT/);
+  });
+
+  it("parseGradeVerdict reads CORRECT / INCORRECT", () => {
+    assert.equal(parseGradeVerdict("VERDICT: CORRECT").correct, true);
+    assert.equal(parseGradeVerdict("verdict: incorrect — wrong number").correct, false);
+  });
+
+  it("parseGradeVerdict defaults to incorrect on unparseable output (never credits a wrong answer)", () => {
+    assert.equal(parseGradeVerdict("hmm, hard to say").correct, false);
+  });
+});