mise API - v0.0.0
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    Variable LIST_CACHE_SIGNAL_BACKED_TTL_MSConst

    LIST_CACHE_SIGNAL_BACKED_TTL_MS: number = ...

    Lifetime for a path /proc reports movement on.

    Long by design: arrivals, departures and job completions mark these dirty as they happen, so the clock is a backstop against a missed notification rather than the mechanism.