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/src/harness/tools/tool-context.ts

@@ -0,0 +1,6 @@
+import type { ExecutionEnv } from "../types.ts";
+
+/** Filesystem and shell context required by the built-in execution tools. */
+export interface ExecutionToolContext {
+	env: ExecutionEnv;
+}