Macro start_root 

macro_rules! start_root {
    ($(init = $init:block)? $(,)?) => { ... };
}

Configure lifecycle hooks for the root orchestrator canister.

This macro behaves like start!, but delegates to root-specific lifecycle adapters.

IMPORTANT:

• The macro does NOT perform root orchestration
• The macro does NOT import WASMs
• The macro does NOT create canisters
• The macro may schedule async hooks via timers, but must never await them