fix(io): read Vizgen MERSCOPE datasets#60
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Implement MerscopePreprocessor (was NotImplementedError on main): resolve the detected_transcripts.csv / transcripts.parquet source, map cell/nucleus assignment columns to the standard schema, inline the BLANK feature filter, and load cell/nucleus boundary parquets (mirroring one onto the other when only one is present). Bundles the small column/boundary helpers it needs, so it is self-contained and independent of the platform-detection feature. What to review: - src/segger/io/preprocessor.py: the helper functions + the new MerscopePreprocessor class. - src/segger/io/fields.py: Merscope fallback_filename + boundary-id fields. - Minimal: no qv/z or synthetic boundaries. Base: main (does not depend on feat/io-platform-detection).
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Implement MerscopePreprocessor (was NotImplementedError on main): resolve the detected_transcripts.csv / transcripts.parquet source, map cell/nucleus assignment columns to the standard schema, inline the BLANK feature filter, and load cell/nucleus boundary parquets (mirroring one onto the other when only one is present). Bundles the small column/boundary helpers it needs, so it is self-contained and independent of the platform-detection feature.
What to review:
Base: main (does not depend on feat/io-platform-detection).