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/coding-agent/src/bun/sandbox-env-setup.ts

@@ -0,0 +1,4 @@
+import { restoreSandboxEnv } from "./restore-sandbox-env.ts";
+
+// Restore the environment before evaluating modules that read it at startup.
+restoreSandboxEnv();