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/client/vitest.config.ts

@@ -0,0 +1,17 @@
+import { fileURLToPath } from "node:url";
+import { defineConfig } from "vitest/config";
+
+export default defineConfig({
+	test: {
+		globals: true,
+		environment: "node",
+		reporters: process.env.GITHUB_ACTIONS ? ["dot", "github-actions"] : ["dot"],
+	},
+	resolve: {
+		conditions: ["source"],
+		alias: {
+			"@earendil-works/pi-protocol": fileURLToPath(new URL("../protocol/src/index.ts", import.meta.url)),
+		},
+	},
+	ssr: { resolve: { conditions: ["source"] } },
+});