[Snappy] Proximity spacing additional validator

[piotrkluba]

Note

Medium Risk
Tightens validation by turning an auto-correcting warning into hard ValueErrors, which can break existing configs that previously passed and were silently clamped. Changes are localized to snappy meshing parameter validation with low runtime risk but potential user-facing validation failures.

Overview
Enforces stricter proximity_spacing validation for Snappy refinements. SnappyEntityRefinement now raises a ValueError when proximity_spacing > min_spacing instead of logging a warning and mutating the value.

Adds default-aware validation for BodyRefinement. When min_spacing is omitted, SurfaceMeshingParams now rejects BodyRefinement.proximity_spacing values that exceed defaults.min_spacing, and new tests cover both failing and passing cases for these scenarios.

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[benflexcompute]

use add_validation_warning()

[benflexcompute]

Changing the user input in the validator is something I try to avoid, I cannot say exactly what is wrong with it but it feels strange to make SimulationParams mutable during the validation process.

I guess we cannot make this an error and ask user to fix it b.c. it breaks compatibility. Let's keep this as is for now and we will see how this holds up.

[piotrkluba]

Tbh, we coul eaisly make this an error. Snappy does not have any real users really and its a small change so we can make this an error if you wiss

[piotrkluba]

Made it an error

[cursor]

Cursor Bugbot has reviewed your changes and found 1 potential issue.

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