fix: backcompat for init/defrag (#741)

Co-authored-by: Letta <noreply@letta.com>

src/agent/memory.ts

@@ -14,11 +14,7 @@ export const GLOBAL_BLOCK_LABELS = ["persona", "human"] as const;
 /**
  * Block labels that are stored per-project (local to the current directory).
  */
-export const PROJECT_BLOCK_LABELS = [
-  "skills",
-  "loaded_skills",
-  "memory_filesystem",
-] as const;
+export const PROJECT_BLOCK_LABELS = ["skills", "loaded_skills"] as const;
 
 /**
  * All available memory block labels (derived from global + project blocks)