Discover the party board's children from the household roster (Feature 20)
The board rendered nothing until a parent hand-wrote child_order with each child's slug — the DAKOS bring-up gap. The household rollup now publishes an ordered child_roster attribute (snapshot sort_order, each entry carrying the slug the way HA derives entity ids, so the card can build sensor.nestquest_<slug>_...), and the card discovers its plates from it when the config carries no child_order; a supplied child_order still wins. The rollups' existing per-child children counts attribute is unchanged. Render tests drive the committed bundle under jsdom, so the discovery contract is asserted on the artifact HACS ships.
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