Generate web slides from Comark

feat(core): pronouns + handle + reworked title/outro composition master

Two improvements landed together because they share a CSS path: 1. Optional pronouns + handle in frontmatter, rendered as a quieter byline beneath the speaker name. Pronouns get Recursive's slnt/CASL axes (italic aside, the same gesture DESIGN.md uses for blockquotes); handle gets the MONO axis (technical identifier). Equal Muted color and equal size so neither piece dominates. 2. Title and outro now have layout-specific section grids and reduced padding (space.md vs the previous space.xl), giving the marquee and colophon room to hug the slide edges and the hero room to breathe. - Title: vertical stack (marquee / hero / colophon). Wordmark spans the full slide width with its natural two-line break; colophon is a horizontal row at the bottom — attribution stacked on the left, socials aligned to the bottom-right baseline of the last context line, hairline above. - Outro: two-column grid ("Thank you" left, colophon stack right, marquee spans the top). The short outro h1 doesn't need full slide width; the right column gets enough space to host attribution + context + socials comfortably with no hairline (the column gap is the separator). Light-DOM grid-area assignments live in slide-styles.eta and cascade into the shadow-DOM grid via the slot's display: contents. data-has-colophon on the host triggers the grid template; without frontmatter the bare title/outro composition is unchanged. 3. Marquee spacing scrubbed of ch units (gap: 2cqi, padding: 1cqmin 0) so it scales strictly with the slide. examples/showcase.md adds pronouns + handle to the frontmatter so the demo deck exercises every field. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>


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