Governs whether registered startup engines pre-warm during Startup().
'full': today's behavior — sync engines awaited in priority groups, then
deferred engines fired. The right choice for long-running servers (MJAPI).
'task': no registered engines execute (sync or deferred); every engine
lazy-loads on first touch via its own Config()/EnsureLoaded() call. The
right choice for short-lived CLI/script processes (MJCLI, mj-sync, CodeGen).
LocalCacheManager initialization runs in BOTH modes — it is provider
infrastructure, not an engine pre-warm.
Governs whether registered startup engines pre-warm during Startup().
LocalCacheManager initialization runs in BOTH modes — it is provider infrastructure, not an engine pre-warm.