feat: use Leaflet documents for rich-text descriptions

[holkexyz]

Summary

• Replace description (string) + descriptionFacets (array) with a single Leaflet linear document ref in activity and attachment lexicons, matching the existing pattern in collection
• Make content optional on attachment records

Test plan

• npm run check passes (gen-api, lint, typecheck, build, test)
• Verify activity, attachment, and collection descriptions all use the same Leaflet pattern

🤖 Generated with Claude Code

[changeset-bot]

🦋 Changeset detected

Latest commit: 9994ea1

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@hypercerts-org/lexicon	Minor

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📥 Commits

Reviewing files that changed from the base of the PR and between ee144e4 and 9994ea1.

📒 Files selected for processing (4)

• .changeset/flat-llamas-crash.md
• SCHEMAS.md
• lexicons/org/hypercerts/claim/activity.json
• lexicons/org/hypercerts/context/attachment.json

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch feat/leaflet-descriptions

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[holkexyz]

FYI I reordered some fields in the activity claim, which might look like a bigger change in the files, but it isn't:)