chore: Update fff to 0.9.4 (#31583)

packages/core/package.json

@@ -85,7 +85,7 @@
     "@effect/platform-node": "catalog:",
     "@effect/sql-sqlite-bun": "catalog:",
     "@lydell/node-pty": "catalog:",
-    "@ff-labs/fff-bun": "0.9.3",
+    "@ff-labs/fff-bun": "0.9.4",
     "@npmcli/arborist": "9.4.0",
     "@npmcli/config": "10.8.1",
     "@opencode-ai/effect-drizzle-sqlite": "workspace:*",

packages/core/src/filesystem/fff.bun.ts

@@ -12,6 +12,10 @@ import {
   type SearchResult,
 } from "@ff-labs/fff-bun"
 
+declare global {
+  const FFF_LIBC: "gnu" | "musl"
+}
+
 export type Result<T> = { ok: true; value: T } | { ok: false; error: string }
 
 export type Init = InitOptions