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/storage.bench.ts

@@ -0,0 +1,35 @@
+import {
+	STORAGE_BENCHMARK_DATASETS,
+	STORAGE_READ_BENCHMARK_SCENARIOS,
+	STORAGE_WRITE_BENCHMARK_SCENARIOS,
+	seedStorageBenchmark,
+} from "../../src/harness/session/testing/index.ts";
+import { registerReadBenchmarks, registerWriteBenchmarks } from "./benchmark.ts";
+import { storageBenchmarkTargets } from "./storage-targets.ts";
+
+await registerReadBenchmarks({
+	datasets: STORAGE_BENCHMARK_DATASETS,
+	targets: storageBenchmarkTargets,
+	scenarios: STORAGE_READ_BENCHMARK_SCENARIOS,
+	prepare(fixture, dataset) {
+		return seedStorageBenchmark(fixture.storage, dataset);
+	},
+	getSubject(fixture) {
+		return fixture.storage;
+	},
+});
+
+await registerWriteBenchmarks({
+	targets: storageBenchmarkTargets,
+	scenarios: STORAGE_WRITE_BENCHMARK_SCENARIOS,
+	async prepare(fixture, scenario) {
+		await scenario.prepare?.(fixture.storage);
+		return fixture.storage;
+	},
+	expectedResult(scenario) {
+		return scenario.writeCount;
+	},
+	run(storage, scenario) {
+		return scenario.run(storage);
+	},
+});