fix(sos): SOS constraints on masked variables (#688)#692

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FBumann wants to merge 6 commits into

refactor/sos-reformulation-methodsfrom

fix/sos-masked-direct-api

Commits on May 18, 2026

test(sos): regression matrix for masked SOS variables (#688)

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fix(sos): resolve linopy labels to solver column positions in direct builds

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fix(sos): filter masked SOS members + robust set id in LP writer

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test(pwl): convert masked-sos2 NaN-padding test to positive assertion

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test(sos): move masked-reformulation test to test_sos_reformulation

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refactor(sos): extract _iter_sos_sets to deduplicate direct-API plumbing

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