refactor(lexicons): add reaction tokens, category format, and communityRef (#36)
Add knownValues with token definitions (like, heart, thumbsup) to the
reaction type field following AT Protocol conventions. Annotate the
category field with format: "record-key" for machine-readable semantics.
Populate the previously empty defs.json with a reusable communityRef
type. Regenerate TypeScript types, update Zod validation schemas, and
add corresponding tests. Bump version to 0.1.2.
All changes are non-breaking -- backward compatibility tests pass.
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