fix(io): robustly read NanoString CosMX datasets#63
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Generalize CosMXPreprocessor so CosMX exports actually read: resolve the transcripts source (CSV glob or transcripts.parquet fallback), resolve x/y/feature/assignment/compartment columns by candidate names, map CosMX compartments to the standard schema, and read cell/nucleus polygons from masks. Bundles the small column/boundary resolution 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 CosMXPreprocessor rewrite (validate / transcripts / boundaries). - src/segger/io/fields.py: CosMx fallback_filename. - Verify against a real CosMX export. Minimal: no qv/z or synthetic boundaries. Base: main (does not depend on feat/io-platform-detection).
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Generalize CosMXPreprocessor so CosMX exports actually read: resolve the transcripts source (CSV glob or transcripts.parquet fallback), resolve x/y/feature/assignment/compartment columns by candidate names, map CosMX compartments to the standard schema, and read cell/nucleus polygons from masks. Bundles the small column/boundary resolution 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).