feat(registry): add podcast/interview lower-thirds pack (10 blocks)

[sunlesshalo]

What

Adds a podcast / interview lower-thirds pack — 10 blocks across three families — to the registry. Fills the catalog's stated gap: "What's Needed Right Now → Lower thirds: 10 variations for podcasts/interviews (Easy)."

The only existing lower third, yt-lower-third, is a YouTube subscribe widget; these are name / role identifiers (bottom-left broadcast convention), so there's no overlap.

The pack

Clean (light cards)

• lt-clean-bar — white card + accent tab, clip-wipe entrance
• lt-soft-pill — rounded pill + status dot, scale-pop
• lt-dark-card — charcoal card + drawn accent underline, slide-up

Underline (cardless — for footage; text-shadowed)

• lt-accent-underline — condensed caps + an accent rule that draws left→right
• lt-side-rule — vertical accent bar draws top→down
• lt-mask-reveal — accent sweep clip-path-reveals a heavy name

Bold (podcast)

• lt-bold-block — dark block wipes in, caps slam, mono tag pops
• lt-color-block — accent-color block slides in with overshoot
• lt-stack-bars — name bar wipes from the left, accent role bar from the right
• lt-kicker-name — accent kicker/eyebrow, heavy name, drawn baseline

Preview

Labeled 2×5 grid — all 10 blocks in motion (4.8s loop):

Conventions

• 1920×1080, 4.8s, transparent overlay (overlay-ready), single data-composition-id.
• Bundled auto-resolve fonts only (Montserrat, Oswald, League Gothic, Archivo Black, Space Mono, JetBrains Mono) — no Google Fonts <link>, so they render offline / deterministically with zero font lint warnings.
• Determinism: paused GSAP timeline on window.__timelines; no Math.random() / Date.now() / timers; class="clip" timing wrapper (with id) + an inner animated element; hard-killed exit; #root-scoped CSS.
• Original, generic design — no third-party branding; placeholder copy only (Dr. Maya Chen / Host · Neuroscientist).

Verification

Every block passes:

• hyperframes lint → 0 errors / 0 warnings
• hyperframes validate → no console errors

(The cardless variants log advisory WCAG contrast warnings — expected for transparent overlays, where contrast depends on the underlying footage; the text-shadows handle legibility.)

Renders are deterministic, so any block reproduces identically via:

hyperframes render registry/blocks/<name> -o <name>.mp4

Notes for maintainers

• registry/registry.json updated with the 10 hyperframes:block entries.
• I did not run scripts/generate-catalog-pages.ts (to avoid generated-page churn) — happy to run it, split into smaller PRs, or adjust naming / grouping per your preference.
• Per the contributing guide, preview hosting is left to maintainers.