Free surface in 3D: spherical shell support, dimension-general surface machinery, and the 2D compatibility-floor fix - #469

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Commits on Aug 4, 2026

feat(free-surface): FE trace-mass datum gauge from DMPlex facets (dimension-general)
lmoresi
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fix(free-surface): FE-consistent directed flux strip + pressure-gauge quotient convergence — deformed-ring floor resolved
lmoresi
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feat(free-surface): 3D spherical shell support - dimension-general surface machinery + P1-projected sigma_nn recovery
lmoresi
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test+docs: 3D spherical FreeSurface capability test; changelog for the 3D free surface
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review: response commit — empty-rank surface guard, pressure-gauge observability, trace-mass conservation assert, docstring currency
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