feat: integrate Pi backend and Pi Web

pi/packages/evals/test/pi-harness.test.ts

@@ -0,0 +1,34 @@
+import { describe, expect, it } from "vitest";
+import { resolveModelSelection } from "../src/pi-harness.ts";
+
+describe("resolveModelSelection", () => {
+	it("prefers an explicit harness model over environment defaults", () => {
+		expect(
+			resolveModelSelection(
+				{ provider: "anthropic", id: "claude-opus-4-6" },
+				{ PI_PROVIDER: "openai-codex", PI_MODEL: "gpt-5.6-sol" },
+			),
+		).toEqual({ provider: "anthropic", id: "claude-opus-4-6" });
+	});
+
+	it("uses trimmed environment defaults when the harness has no explicit model", () => {
+		expect(resolveModelSelection(undefined, { PI_PROVIDER: " openai-codex ", PI_MODEL: " gpt-5.6-sol " })).toEqual({
+			provider: "openai-codex",
+			id: "gpt-5.6-sol",
+		});
+	});
+
+	it.each([
+		[undefined, {}],
+		[undefined, { PI_PROVIDER: "openai-codex" }],
+		[undefined, { PI_MODEL: "gpt-5.6-sol" }],
+		[
+			{ provider: "", id: "gpt-5.6-sol" },
+			{ PI_PROVIDER: "openai-codex", PI_MODEL: "gpt-5.6-sol" },
+		],
+	] as const)("rejects an incomplete model selection", (explicitModel, environment) => {
+		expect(() => resolveModelSelection(explicitModel, environment)).toThrow(
+			"Select a harness model explicitly or set both PI_PROVIDER and PI_MODEL as defaults.",
+		);
+	});
+});