Give Lumina its theme-owned interpretation of [data-reading="prose"] and generalise textblock's dropcap to a prose-register-gated opt-in. Per SPEC-108 §2–§3 + Work breakdown 3.
Tracking started Jun 25 — check back for trends.
17d2678[data-reading="prose"] (not rune-name lists) in Lumina: capped measure (--rf-measure, distinct from width), a paragraph style, lede eligibility, and running-text niceties (hanging punctuation, link underline, widow/orphan, hyphenation). fine gets its smaller/tighter treatment; ui is unchanged.dropcap: plumb it centrally (not re-declared per rune) and gate it on the resolved prose register via READING_CAPABILITIES (WORK-476); a no-op (dev warn) off-register. The non-rune article body reaches it by wrapping the opening passage in textblock. The theme owns the glyph treatment; the author owns where.textblock keeps columns as its own feature; its body becomes reading="prose".reading="prose" drives a theme-owned editorial treatment in Lumina: capped measure (distinct from width), a paragraph style, lede eligibility, and running-text niceties — selected by [data-reading="prose"], not rune-name lists.dropcap is a per-instance opt-in available on any prose body (generalised from textblock), gated on the resolved prose register (not a rune allowlist) and a no-op elsewhere; the theme owns the glyph treatment.measure and width remain independent — a width: full block can hold reading: prose text at a capped measure (the editorial-header composition renders correctly, light + dark).[data-reading] emission + the READING_CAPABILITIES gate.prose to style.packages/lumina/styles/dimensions/sections.css, packages/runes/src/tags/textblock.ts.