// ABOUTME: Shared predicates for sampling high-frequency log lines
// ABOUTME: Keeps trace/debug logs useful without flooding normal runs
/// Return `true` for counts 1-5, 10, and every multiple of 100.
///
/// Intended for high-frequency diagnostic logs where startup behavior matters
/// but every steady-state event is redundant: callers see every early event,
/// one checkpoint at 10, then a periodic heartbeat. `count` is one-based; zero
/// returns `false`.
pub