variantLanguages: filter to published variants

[tanflem]

Parent

Sub-issue of #9515 (Rebuild Video.availableLanguages as one cycle-safe, recursively-correct source of truth).

What to build

Video.variantLanguages (a video's own direct variant languages, intentionally flat and unrelated to the recursive availableLanguages work) is missing the published: true filter that its sibling field variantLanguagesCount already has, so an unpublished variant's language can currently appear in a language picker meant to reflect only what's actually available. The filter is added to match. This is unrelated to and independent of the rest of #9515 — a small, adjacent, same-file bug fix.

Acceptance criteria

• variantLanguages filters to published: true variants, matching variantLanguagesCount's existing filter.
• A video with one published and one unpublished variant: variantLanguages returns only the published variant's language.
• variantLanguages' semantics otherwise remain unchanged — it stays a flat, own-video-only field, not recursive.

Blocked by

None (can start immediately) — unrelated field, independent fix.

[tanflem]

🔒 Phoebe holds a lease on this issue — runtime 23d237d8-ffd4-4f4e-960e-7682f69cf890, branch phoebe/bot-0-issue-9524.

This lease is refreshed periodically while work is in progress. If the heartbeat goes stale (the runtime died) or this runtime restarts, Phoebe reclaims the issue back to the ready queue automatically — no manual relabel needed.

[tanflem]

Addressed by Phoebe: #9529

[tanflem]

🔒 Mergetron holds a lease on this issue — runtime 23d237d8-ffd4-4f4e-960e-7682f69cf890, branch phoebe/bot-0-issue-9524.

This lease is refreshed periodically while work is in progress. If the heartbeat goes stale (the runtime died) or this runtime restarts, Mergetron reclaims the issue back to the ready queue automatically — no manual relabel needed.