Add re-exports to package root for core types#17

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MarketDataApp wants to merge 2 commits intomainfrom

feature/package-root-exports

Commits on Feb 18, 2026

Add re-exports to package root for MarketDataClient, MarketDataClientErrorResult, OutputFormat, DateFormat, and Mode
MarketDataApp
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Update .gitignore to exclude .DS_Store files and bump marketdata-sdk-py version to 1.2.0
MarketDataApp
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