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v0.0.22

New: FrameData tabular data model

lythonic.frame.FrameData is a Pydantic model for tabular data stored as columns + row-oriented data. It serializes to/from JSON with no DataFrame library dependency.

Conversion methods for pandas, polars, and pyarrow lazily import their respective libraries, so they are only needed when actually used. New optional extras pandas, polars, and pyarrow install them; CI runs a matrix job testing each extra individually.