feat: Python backend (appkit-py) #274

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jamesbroadhead wants to merge 13 commits intodatabricks:mainfrom

jamesbroadhead:feat/appkit-py

Commits on Apr 15, 2026

Add INLINE + ARROW_STREAM format support for analytics plugin
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Add tests for ARROW_STREAM and ARROW format parameter handling
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fix: propagate ARROW_STREAM format to UI layer and typegen
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fix: default analytics format to ARROW_STREAM for broadest warehouse compatibility
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feat: automatic format fallback for warehouse compatibility
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fix: handle ARROW_STREAM + INLINE data in _transformDataArray
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feat: decode inline Arrow IPC attachments from serverless warehouses
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feat: add Python backend (appkit-py) with 100% API compatibility
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fix: address ACE multi-model review findings
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fix: address GPT 5.4 review findings — OBO auth, statement error states, path traversal
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fix: implement remaining review findings — Arrow IPC, maxSize, workspaceId
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feat: add format fallback for analytics queries (ARROW_STREAM → JSON → ARROW)
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refactor: adopt plugin-first architecture matching TS AppKit design
jamesbroadhead
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