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/agent/benchmark/session/session-repo-targets.ts

@@ -0,0 +1,22 @@
+import { MemorySessionRepo } from "../../src/harness/session/index.ts";
+import type { SessionRepo } from "../../src/harness/session/types.ts";
+import type { BenchmarkTarget } from "./benchmark.ts";
+
+export interface SessionRepoBenchmarkFixture extends AsyncDisposable {
+	readonly repo: SessionRepo;
+}
+
+const NOW = 1_700_000_000_000;
+
+export const sessionRepoBenchmarkTargets = [
+	{
+		name: "memory",
+		createFixture() {
+			const repo = new MemorySessionRepo({ now: () => NOW });
+			return Promise.resolve({
+				repo,
+				[Symbol.asyncDispose]: () => repo.close(),
+			});
+		},
+	},
+] satisfies readonly BenchmarkTarget<SessionRepoBenchmarkFixture>[];