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/session-backends/sqlite-node/scripts/copy-migrations.mjs

@@ -0,0 +1,7 @@
+import { cp, mkdir } from "node:fs/promises";
+
+const source = new URL("../src/sqlite/migrations/", import.meta.url);
+const target = new URL("../dist/sqlite/migrations/", import.meta.url);
+
+await mkdir(target, { recursive: true });
+await cp(source, target, { recursive: true });