fix(memory): reject blank memory_id on edit and delete (#6342)

In src/ai_interaction.py, when parsing text-format edit or delete actions, an empty line 2 caused memory_id to resolve to empty string. Because startswith("") is always True, the first stored memory was inadvertently edited or deleted.

This change validates that memory_id is non-empty before searching the memory list, restoring parity with the MCP memory tool.

Fixes #6342.

src/ai_interaction.py

@@ -420,6 +420,8 @@ async def do_manage_memory(content: str, session_id: Optional[str] = None, owner
             return {"error": "Edit needs line 2: memory_id, line 3: new text"}
         memory_id = lines[1].strip()
         new_text = lines[2].strip()
+        if not memory_id:
+            return {"error": "Edit needs line 2: memory_id"}
         if not new_text:
             return {"error": "New text cannot be empty"}
 
@@ -453,6 +455,8 @@ async def do_manage_memory(content: str, session_id: Optional[str] = None, owner
         if len(lines) < 2:
             return {"error": "Delete needs line 2: memory_id"}
         memory_id = lines[1].strip()
+        if not memory_id:
+            return {"error": "Delete needs line 2: memory_id"}
 
         memories = _memory_manager.load_all()
         original_len = len(memories)