Host memory is the binding limit, so never schedule two HEAVY recipes in the
same capacity wave — pair each heavy (discourse/immich/matrix-synapse/
lasuite-drive/mattermost-lts/ghost) with a light one to bound peak memory while
keeping both slots busy. Heaviest-first could co-schedule two heavies and OOM/
wedge the box (the disc-50cc8a 'New'-state wedge). For CAP>2 cap heavies at
~CAP/2; if only heavies remain, run one-per-wave.
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