chore: add design refinement issues for atproto lexicon schemas
Created chainlink issues for upcoming design work:
- #64: Redesign ndarrayShimUri for multiple array storage methods
- #65: Review optional metadata fields in sampleSchema
- #66: Remove redundant previousVersion/migrationLens fields
- #67: Refactor jsonSchema to flexible schema field with reference type
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Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
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