fix(core): update memfs client to use memory/ directory (#9322)

PR #9309 changed the block storage from blocks/ to memory/ directory.
Update memfs_client.py and memfs_client_base.py to match.

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

letta/server/rest_api/routers/v1/git_http.py

@@ -507,7 +507,7 @@ async def _sync_after_push(actor_id: str, agent_id: str) -> None:
             # Detach blocks that were removed in git.
             #
             # We treat git as the source of truth for which blocks are attached to
-            # this agent. If a blocks/*.md file disappears from HEAD, detach the
+            # this agent. If a memory/*.md file disappears from HEAD, detach the
             # corresponding block from the agent in Postgres.
             try:
                 existing_blocks = await _server_instance.agent_manager.list_agent_blocks_async(

letta/services/memory_repo/memfs_client_base.py

@@ -26,7 +26,7 @@ from letta.utils import enforce_types
 logger = get_logger(__name__)
 
 # File paths within the memory repository
-BLOCKS_DIR = "blocks"
+MEMORY_DIR = "memory"
 METADATA_FILE = "metadata/blocks.json"
 
 # Default local storage path
@@ -89,7 +89,7 @@ class MemfsClient:
         metadata = {"blocks": {}}
 
         for block in initial_blocks:
-            file_path = f"{BLOCKS_DIR}/{block.label}.md"
+            file_path = f"{MEMORY_DIR}/{block.label}.md"
             initial_files[file_path] = block.value or ""
             metadata["blocks"][block.label] = {
                 "description": block.description,
@@ -149,8 +149,8 @@ class MemfsClient:
         # Convert block files to PydanticBlock
         blocks = []
         for file_path, content in files.items():
-            if file_path.startswith(f"{BLOCKS_DIR}/") and file_path.endswith(".md"):
-                label = file_path[len(f"{BLOCKS_DIR}/") : -3]
+            if file_path.startswith(f"{MEMORY_DIR}/") and file_path.endswith(".md"):
+                label = file_path[len(f"{MEMORY_DIR}/") : -3]
                 block_meta = metadata.get(label, {})
 
                 # Generate deterministic UUID-style ID from agent_id + label
@@ -237,7 +237,7 @@ class MemfsClient:
 
         await self._ensure_repo_exists(agent_id, actor)
 
-        file_path = f"{BLOCKS_DIR}/{label}.md"
+        file_path = f"{MEMORY_DIR}/{label}.md"
         commit_message = message or f"Update {label}"
 
         return await self.git.commit(
@@ -299,7 +299,7 @@ class MemfsClient:
         # Prepare changes
         changes = [
             FileChange(
-                path=f"{BLOCKS_DIR}/{block.label}.md",
+                path=f"{MEMORY_DIR}/{block.label}.md",
                 content=block.value,
                 change_type="add",
             ),
@@ -368,7 +368,7 @@ class MemfsClient:
         # Prepare changes
         changes = [
             FileChange(
-                path=f"{BLOCKS_DIR}/{label}.md",
+                path=f"{MEMORY_DIR}/{label}.md",
                 content=None,
                 change_type="delete",
             ),