Function reconcile_timers 

pub fn reconcile_timers(
    role: &Role,
    election: &mut Option<SimInstant>,
    fetch: &mut Option<SimInstant>,
    heartbeat: &mut Option<SimInstant>,
    quorum: &mut Option<SimInstant>,
    heartbeat_deadline: SimInstant,
)

Enforce per-role timer ownership, preserving existing leader heartbeats.