Fixed

• MCP update_task: when section and other fields (e.g. assignee) were combined in one call, the section moved correctly but all other field changes were silently dropped; the task was re-read from disk on move, discarding the merged update payload — now the fully merged task is written before the old file is removed

Added

• MCP list_tasks: new assignee filter (person ID) and priority filter (integer 1–5) so Claude can query tasks assigned to itself or by priority without fetching all tasks and filtering client-side