Function run_set_version 

pub fn run_set_version(ctx: &CliContext, args: SetVersionArgs) -> Result<()>

memstead mem set-version <NAME> <VERSION> — bump the mem’s version field via the in-process engine, persisting through the backend’s write_mem_config. Unlike init / delete, this surface doesn’t spawn the MCP subprocess: set-version is gate-free (no operator-mode bypass needed), so a direct engine call keeps the implementation simpler and faster.