chore(vendor): import pi 1.3.0

Imported as a linear vendor commit so forge rebases do not replay the upstream root tree.

git-subtree-dir: third_party/pi

git-subtree-split: 71023aec1546d6d677a65669c5665c0927ce0dd0

third_party/pi/packages/evals/test/plan.test.ts

@@ -0,0 +1,42 @@
+import { describe, expect, it } from "vitest";
+import { createTaskPlan, parseDiscoveredCases } from "../src/plan.ts";
+
+const discovered = [{ name: "Add model > adds the model", file: "evals/models.docs.eval.ts" }];
+
+describe("parseDiscoveredCases", () => {
+	it("derives stable case identity from ordinary Vitest names", () => {
+		expect(parseDiscoveredCases(discovered)).toEqual([
+			{
+				fullName: "Add model > adds the model",
+				evalSet: "Add model",
+				caseId: "adds the model",
+				file: "evals/models.docs.eval.ts",
+			},
+		]);
+	});
+
+	it("rejects ambiguous and duplicate identities", () => {
+		expect(() => parseDiscoveredCases([{ name: "adds the model", file: "model.ts" }])).toThrow("<eval set> > <case>");
+		expect(() => parseDiscoveredCases([...discovered, ...discovered])).toThrow("Duplicate eval case identity");
+	});
+});
+
+describe("createTaskPlan", () => {
+	it("creates one isolated task per case, variant, model, and repetition", () => {
+		const cases = parseDiscoveredCases(discovered);
+		const tasks = createTaskPlan(cases, "fixture/model", 2);
+		expect(tasks).toHaveLength(4);
+		expect(tasks.map(({ variant, runNumber }) => [variant, runNumber])).toEqual([
+			["without_docs", 1],
+			["with_docs", 1],
+			["with_docs", 2],
+			["without_docs", 2],
+		]);
+	});
+
+	it("rejects invalid model identities and repetitions", () => {
+		const cases = parseDiscoveredCases(discovered);
+		expect(() => createTaskPlan(cases, "model", 1)).toThrow("provider and model");
+		expect(() => createTaskPlan(cases, "fixture/model", 0)).toThrow("positive integer");
+	});
+});