train/sft: add type annotations to all Python scripts#85
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Add comprehensive Python type annotations across all 18 scripts in train/sft/, improving IDE support and debuggability of raw data dicts. Changes: - Define TypedDict classes for recurring data shapes: ShareGPTMessage, ShareGPTExample, ImageInfo, DatasetInfoEntry, RetrievalRow, RetrievalHit, SplitStats, EvalResult, EMCharMetrics, JudgeMetrics - Annotate all function/method signatures (params + return types) - Type key local variables (accumulators, containers) where not inferrable from context Bug fixes discovered during analysis: - download_tiles.py: collect_paths() had return annotation set[str] but actually returns dict[str, str | None] — fixed - prepare_sft_data_variable.py L100: removed dead dict comprehension expression whose result was discarded No behavioral changes beyond the dead-code removal. All files pass ruff check, ruff format, and py_compile.
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Add comprehensive Python type annotations across all 18 scripts in train/sft/, improving IDE support and debuggability of raw data dicts.
Changes:
Bug fixes discovered during analysis:
No behavioral changes beyond the dead-code removal. All files pass ruff check, ruff format, and py_compile.
Closes #84