F1c (exit-heavy): DomCascade.pending() aggregates the items' finished so the owner Presence holds the subtree until the exit cascade settles (PresenceOptions.pending, Presence.startPhase). beginEnter drives the enter from the off-state with the transition suppressed (items mount in the on-state, so a passive mirror would ease toward off instead of jumping). pending() settles each finisher (then(noop,noop)) so one cancelled row can't collapse the wait.
F2: wire the children-DOM cascade into the real dropdown-menu. Content part declares animation.surface+staggerChildren; provider routes an opt-in 'animation' prop, runs a DomCascade over getCascadeRows (every visible row incl. disabled), forwards a pending hook through the floating shell. Coexistence fixes surfaced by the menu: item rows hand their transition to the cascade-* preset via a higher-specificity rule (longhands keep the stagger delay); disabled opacity gated off during the cascade; the panel's own dismiss-fade signature suppressed in cascade mode (data-cascade) so it doesn't fade the panel before the rows finish; the trigger is excluded from the menu's dismissal so the toggle closes (pre-existing bug). Verified in a real browser (Playwright): enter+exit cascade with reversed stagger, all four close methods, disabled row fades. dom-cascade 9/9, check 0 new errors.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
El piloto M9 (dropdown-menu) destapó que el PresenceGroup coordina children
que son `Presence` REGISTRADOS (Reveal/Rail), pero un menú real es owner-
`Presence` (el content monta como unidad) + children-DOM (items por selector,
sin `Presence`). 3 grietas en 3 capas: registro, index per-item, y escribir
una CSS-var per-element (que ActiveDom no cubría).
Modo children-DOM (la 2ª coordinación): el owner PROPAGA su lifecycle a los
items DOM — escribe data-animation-style + data-starting/ending-style (espejo
del owner) + --motion-stagger-index/-count (por orden DOM), reutilizando el
preset coordinado de eidos SIN cambios (los items quedan con los mismos attrs
que un child-`Presence` produciría).
F1 (núcleo):
- morfo: `MorfoPart.animation.staggerChildren?: string` (types + schema +
invariante: requiere surface, excluye children).
- adom: `ActiveDom.writeProperty/removeProperty` per-element (la pieza que
faltaba; + stub disabled).
- soma: `DomCascade` (`dom-cascade.svelte.ts` — `sync`/`clear` puros y
testeables, `watch()` corre el $effect espejo) + barrel export.
F1b (validación aislada): demo `/temas/animations/dom-cascade` (owner Presence
+ items DOM + DomCascade.watch). Cazó un bug que el test no veía: DomCascade
usa $effect → debe ser `.svelte.ts`, no `.ts` (el test solo ejercita sync/clear,
nunca watch()). Cascada de ENTRADA verificada en navegador.
PENDIENTE (en la memoria del proyecto): F1c exit-heavy (el owner espera a los
items — getAnimations no ve subtree), F2 el dropdown-menu real (focus-trap/
dismissal/submenús), y volcar §M9 al RFC.
Tests: dom-cascade 5/5, morfo 70/70. svelte-check: 0 errores en mis archivos.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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