[clbotdev]

Summary

Add rich documentation blocks so Git-sourced docs can retain callouts, tabs, steps, cards, accordions, code groups, and type tables. The editor can author the blocks, Markdown can round-trip them, and published pages render and index their content. Also support code-fence titles and inline code in links and bold text.

Validation

• Text-editor tests: 110 passed; documentation API tests: 363 passed; package typecheck passed; pre-commit formatting and lint passed.
• Browser smoke: created and published a document with all seven blocks, checked public rendering and search, then imported nine MediaLit pages through the sync worker with a stubbed GitHub API. Checked tab clicks, arrow-key navigation, and mobile layout.
• The GitHub App connection was not tested live. Accordion, code-group, card-link and editor interactions still need the additional manual checks identified in the smoke review.
• Accordion type="single" is preserved but items currently open independently; card icons appear after hydration.

Closes #80

QA deployment smoke

Deployed commit 08c80fc to QA with tag qa-pr173-08c80fc (all three images include linux/arm64). The migration and all three rollouts succeeded. In a dedicated QA workspace, signed in using Mailpit, authored and published all seven blocks, and verified public rendering, tab and code-group switching, accordion expansion, a card link, mobile layout, and search for accordion text. The GitHub App sync was not tested on QA.