Stop documenting heading eyebrows ADR-046 decides that an eyebrow is a paragraph directly before the headline, never a heading. The docs still teach the heading form. The guide's only example of it uses hero, which renders it wrongly (BUG-047), and nineteen rune pages say "a short paragraph or heading" in the same boilerplate sentence.The native page-section runes keep their grammar until each one is composed (ADR-046, decision 4), so some of them still accept the heading form. The docs stop recommending it anyway: it is not the direction, and documenting less than a rune accepts is safe where documenting more is not.
medium simple
section takes guest-fit The native hero and feature host a media guest with guestFit: 'bleed', a config field. A config field cannot differ between compositions that place the same section, and hero needs bleed where a card-like composition needs clip (SPEC-160 D7).
medium simple
hero is a composition over section hero becomes a section with a split, cover, the header and {% actions %}, with no rune CSS of its own (SPEC-160 D7). WORK-654 leaves a composed hero fixture; this item completes it and compares it with the plugin.
high complex
A lead layout for blocks A blocks entry renders through bar (a row) or definition-list (a label/value grid). Neither draws a byline, a lead value with secondary values beneath, which testimonial and cast each hand-roll in their CSS (SPEC-161 D6).
medium simple
A theme override aimed at a composed rune is reported and dropped ADR-042 makes a composed rune's config its definition's: a theme cannot know which definition it faces, so an override of a composed rune's blocks or metaFields is a guess that silently resolves to nothing. Nothing enforces this yet. mergeThemeConfig and mergeRuneConfig (packages/transform/src/merge.ts) guard the identity fields on every rune, and nothing else, so a theme's runes: entry keyed to a composed rune's type name applies.v0.44.0 adds the first composed runes a theme could try to override (hero, cta, testimonial), so the guard lands with them.
high simple