GSoC Contributor Passes Midterm, Hardens sbi Builder API in Weeks 7–8

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A Google Summer of Code (GSoC) contributor passed their midterm evaluation after completing weeks 7 and 8 of the program. The work focused on strengthening existing code rather than adding new features, primarily through pull request #1920, which introduced the RatioEstimatorBuilder for the NRE model family. Key improvements included immediate error-raising for invalid config values, rejection of model-incompatible keyword arguments at construction time, and making config dataclasses immutable to prevent silent misuse. The contributor also renamed ambiguous API parameters — z_score_x and z_score_y — to the clearer z_score_input and z_score_condition before the API shipped in any release, avoiding a future breaking change. For the second half of GSoC, the workflow has shifted: the contributor will now draft design proposals for mentor review before implementation begins.

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