A Running, ready server always reported 0/0 players: markRunningReady
never wrote Status.Players, and markStopped only cleared it. The panel
therefore showed an empty tally for live servers.
Extend the readiness probe to also sample the player count. Prober.Probe
now returns a PlayerCount{Online, Max}: RconProber still gates readiness
on Dial+auth, then runs a best-effort `list` and parses the vanilla
reply ("There are N of a max of M players online"). A failed or
unparseable tally is swallowed (0/0) so it never blocks readiness. The
reconciler threads the count into markRunningReady, which writes
Status.Players; markStopped still resets it to zero.
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