chore(release): 0.12.0 — chapters that work on YouTube & Vimeo

[jbrecht]

Lockstep minor release. Bumps tutorial-forge and tutorial-forge-cli to 0.12.0.

What ships

• Chapters now activate on YouTube & Vimeo (Chapters: make emitted markers actually activate on YouTube & Vimeo (+ publishing docs) #52 / feat(core): make chapters activate on YouTube & Vimeo (#52) #53). The .chapters.txt (YouTube) folds sub-10s chapters so YouTube doesn't silently drop the whole list; default chapter-title cap lowered 60→50 (Vimeo's limit). MP4 track and .vtt keep the full per-step list. New exports: enforceMinChapterDuration, YOUTUBE_MIN_CHAPTER_MS. Docs gained a publishing guide.
• Flaky calibration-flash e2e fix (test(core): fix flaky calibration-flash e2e assertion #54). Test-only; production behavior was already correct.

Why minor (not patch)

Two additive public exports + an observable behavior change (the 60→50 title-cap default). Per semver and how 0.11.0 was versioned, that's a minor.

Pre-publish review

The release-reviewer cleared it: versions lockstep at 0.12.0, workspace:* correctly rewritten to the exact pin tutorial-forge@0.12.0 (the 0.11.1 break is handled), packed surface is dist/ + package.json + README + PolyForm LICENSE only, no secrets/stray files, CHANGELOG accurate, 169 tests pass.

Publish (after merge)

git checkout main && git pull && pnpm install && pnpm build
pnpm --filter tutorial-forge publish        # core FIRST (cli exact-pins it)
pnpm --filter tutorial-forge-cli publish
git tag v0.12.0 && git push origin v0.12.0

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