r.watershed: Add comprehensive regression tests #7029

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sumitchintanwar wants to merge 5 commits intoOSGeo:mainfrom

sumitchintanwar:fix/add-existing-tests-r-watershed

Commits on Feb 2, 2026

Commits on Feb 7, 2026

expand tests with better regression coverage
sumitchintanwar
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Commits on Feb 8, 2026

update reference values
sumitchintanwar
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