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.bench.ts

@@ -0,0 +1,62 @@
+import {
+	SESSION_REPO_CATALOG_BENCHMARK_DATASETS,
+	SESSION_REPO_CATALOG_READ_BENCHMARK_SCENARIOS,
+	SESSION_REPO_CATALOG_WRITE_BENCHMARK_SCENARIOS,
+	SESSION_REPO_FORK_BENCHMARK_DATASETS,
+	SESSION_REPO_FORK_WRITE_BENCHMARK_SCENARIOS,
+	seedSessionRepoCatalogBenchmark,
+	seedSessionRepoForkBenchmark,
+} from "../../src/harness/session/testing/index.ts";
+import { registerReadBenchmarks, registerWriteBenchmarks } from "./benchmark.ts";
+import { sessionRepoBenchmarkTargets } from "./session-repo-targets.ts";
+
+await registerReadBenchmarks({
+	datasets: SESSION_REPO_CATALOG_BENCHMARK_DATASETS,
+	targets: sessionRepoBenchmarkTargets,
+	scenarios: SESSION_REPO_CATALOG_READ_BENCHMARK_SCENARIOS,
+	async prepare(fixture, dataset) {
+		await seedSessionRepoCatalogBenchmark(fixture.repo, dataset);
+	},
+	getSubject(fixture) {
+		return fixture.repo;
+	},
+});
+
+await registerWriteBenchmarks({
+	targets: sessionRepoBenchmarkTargets,
+	scenarios: SESSION_REPO_CATALOG_WRITE_BENCHMARK_SCENARIOS,
+	prepare(fixture, scenario) {
+		return scenario.prepare(fixture.repo);
+	},
+	expectedResult(scenario) {
+		return scenario.expectedResult;
+	},
+	run(operation) {
+		return operation.run();
+	},
+});
+
+const forkBenchmarks = SESSION_REPO_FORK_BENCHMARK_DATASETS.flatMap((dataset) =>
+	SESSION_REPO_FORK_WRITE_BENCHMARK_SCENARIOS.map((scenario) => ({
+		name: `${scenario.name} (${dataset.name})`,
+		dataset,
+		scenario,
+	})),
+);
+
+await registerWriteBenchmarks({
+	targets: sessionRepoBenchmarkTargets,
+	scenarios: forkBenchmarks,
+	async prepare(fixture, benchmark) {
+		return {
+			repo: fixture.repo,
+			source: await seedSessionRepoForkBenchmark(fixture.repo, benchmark.dataset),
+		};
+	},
+	expectedResult(benchmark) {
+		return benchmark.scenario.expectedResult(benchmark.dataset);
+	},
+	run(subject, benchmark) {
+		return benchmark.scenario.run(subject.repo, subject.source, benchmark.dataset);
+	},
+});