support class scores CSVs

[joefutrelle]

This mod adds a class scores version "4" which expects CSV files named {bin_lid}.csv containing ROI pids in the first column and classes in the rest. Assumes that there is a header.

[Copilot]

Pull Request Overview

Adds support for version 4 class scores stored as CSV files named {bin_lid}.csv, including file lookup, key listing, and parsing into DataFrames.

• Introduce _get_v4_file, include version 4 in __getitem__ and keys()
• Implement _class_scores_v4 to read CSV, extract ROI numbers, and return a DataFrame
• Update class_scores() dispatch to handle version 4

Comments suppressed due to low confidence (2)

ifcb/data/products/class_scores.py:123

• There are no tests for version 4 CSV parsing. Add unit tests to cover _class_scores_v4, including header handling, index extraction, and dtype conversion to ensure it behaves correctly with expected CSV formats.

    def _class_scores_v4(self):

ifcb/data/products/class_scores.py:124

• [nitpick] This comment would be clearer as a method docstring so that the contract for version 4 parsing is formally documented. Consider moving it under the signature as a """…""" docstring.

        # version 4 is a CSV file, the first column is "pid" which is a string that contains the ROI number