board: feat: draining server toggle (#411) - #414
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Also enable NIX_SHOW_STATS in eval workers so thunks/fn-calls report nonzero, and send a queue-depth snapshot on board-live connect so Overview KPIs populate immediately.
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Closes #411.
POST /admin/draining): pauses dispatch and parks every in-flight evaluation underWaitingReason::Drainingso the instance can be stopped safely; in-memory on the scheduler, so it auto-clears on the next startup (parked evals recovered toQueued).NIX_SHOW_STATS=1, which enables libnixexpr's gatedCounters (GC gauges bypass them, hence heap/alloc worked but counters didn't)./board/livenow sends a queue-depth snapshot on connect instead of waiting up toworker_sample_interval_secs(15s) for the first broadcast.