Add degenerate-shape test coverage for D8 hydro functions (#2713)#2720

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brendancol:deep-sweep-test-coverage-hydro-d8-2026-05-29

Commits on May 29, 2026

Add degenerate-shape test coverage for D8 hydro functions (#2713)
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Address review: assert HAND == 0 for all-stream degenerate input (#2713)
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Commits on May 30, 2026

sweep-test-coverage: record hydro-d8 inspection (issue #2713, PR #2720)
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