chore(vendor): import pi 1.3.0

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: 71023aec1546d6d677a65669c5665c0927ce0dd0

third_party/pi/packages/durable/src/tools/env.ts

@@ -0,0 +1,8 @@
+import type { ExecutionEnv } from "../env/index.ts";
+import type { ToolExecutionApi } from "../harness/types.ts";
+
+/** The call's execution environment; a tool without one fails with an ordinary error result. */
+export function requireEnv(api: ToolExecutionApi): ExecutionEnv {
+	if (api.env === undefined) throw new Error("No execution environment is configured");
+	return api.env;
+}