chore(vendor): import pi 0.85.1

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: d981de1229ef899957bbe968bc8dcda02a21f477

third_party/pi/packages/evals/src/smoke.eval.ts

@@ -0,0 +1,17 @@
+import { expect } from "vitest";
+import { describeEval } from "vitest-evals";
+import { createPiCodingAgentHarness } from "./pi-harness.ts";
+
+const piCodingAgentHarness = createPiCodingAgentHarness({ noTools: "all" });
+
+describeEval("Pi Coding Agent smoke", { harness: piCodingAgentHarness }, (it) => {
+	it("runs a basic prompt end to end", async ({ run }) => {
+		const result = await run("What's the capital of France? Respond with only the city name.");
+
+		expect(result.output.trim()).toBe("Paris");
+		expect(result.errors).toEqual([]);
+		expect(result.usage.provider).toBe(process.env.PI_PROVIDER);
+		expect(result.usage.model).toBe(process.env.PI_MODEL);
+		expect(result.usage.totalTokens).toBeGreaterThan(0);
+	});
+});