Fix context_validator running CASE validators during meshing-only JSON generation

[benflexcompute]

Summary

• generate_process_json with upTo=SurfaceMesh fails when velocity_magnitude=0 without reference_velocity_magnitude, even though operating condition validation is irrelevant for meshing
• Root cause: _intersect_validation_levels returned None when validation_level=None, and context_validator treated None as "run all validators"
• Fix: _intersect_validation_levels returns [] instead of None; context_validator skips when current_levels is None, consistent with validate_conditionally_required_field behavior

Test plan

• Added unit test for _intersect_validation_levels returning [] when validation_level=None
• Added integration test: generate_process_json with velocity_magnitude=0, upTo=SurfaceMesh succeeds
• Existing test_validation_level_intersection and test_generate_process_json still pass

🤖 Generated with Claude Code

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Note

Medium Risk
Changes validation gating semantics (None/unset levels now skip context-aware validators), which could hide expected validation errors if any callers relied on the previous behavior.

Overview
Fixes meshing-only generate_process_json failing due to unrelated Case validators by ensuring “no requested validation levels” means run no context-aware validators.

This updates _intersect_validation_levels to return [] (instead of None) when no levels are requested and adjusts context_validator to skip when there is no active ValidationContext. Tests are updated/added to cover the new intersection behavior and to assert meshing JSON generation succeeds even when velocity_magnitude=0 without a reference velocity.

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