Function require_min 

pub fn require_min(
    field: &str,
    value: i64,
    bound: NumericBound,
) -> Option<ValidationError>

A numeric knob must meet its NumericBound’s minimum — the shared one-liner behind every Option<u32> count / Option<i64> rate field (e.g. RepositoryReplication.spec.sync.parallel), so the rule, its minimum, AND its rationale are written once instead of re-derived per field. field names the exact path for the message (e.g. "RepositoryReplication spec.sync.parallel"). Callers only invoke this for a Some value — an absent knob is always valid and never reaches this helper.