feat(deps): import @barazo-forum/lexicons package (#32)
* feat(deps): import @barazo-forum/lexicons package
Add the shared lexicons package as a dependency, replacing the need for
inline AT Protocol type definitions. Re-exports Zod validation schemas,
lexicon ID constants, and record input types from the central package.
* ci: resolve lexicons link dependency in CI
Checkout and build barazo-lexicons alongside the repo so the
link:../barazo-lexicons dependency resolves during CI runs.
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