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🧱 Mason: Decouple Momentum Equations (Fixes OCP)

  • 🏚️ Violation: The conservation.rs module violated OCP by hardcoding navier_stokes_time_derivative and euler_time_derivative as separate functions, making it impossible to add new physics models without modifying the module.
  • πŸ—οΈ Fix: Implemented the Strategy Pattern via MomentumEquation trait, with NavierStokes and Euler strategies. Introduced SpatialGradients parameter object.
  • πŸ”— Principle: Open/Closed Principle (OCP) - New physics models can now be added by implementing the trait without modifying existing code.
  • πŸ§ͺ Verification: Added unit tests for strategies and verified that existing legacy wrappers still pass tests.

PR created automatically by Jules for task 10265248665521159239 started by @fderuiter

- Introduced `MomentumEquation` trait in `conservation.rs`.
- Implemented `NavierStokes` and `Euler` strategies.
- Added `SpatialGradients` in `types.rs` to unify method signatures.
- Added `FluidError` for structured error handling.
- Deprecated original functions `navier_stokes_time_derivative` and `euler_time_derivative`, reimplementing them as wrappers for backward compatibility.
- Added unit tests for new strategies.

This refactor resolves an OCP violation where adding new physics models required modifying the core conservation module.

Co-authored-by: google-labs-jules[bot] <161369871+google-labs-jules[bot]@users.noreply.github.com>
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- Introduced `MomentumEquation` trait in `conservation.rs`.
- Implemented `NavierStokes` and `Euler` strategies.
- Added `SpatialGradients` in `types.rs` to unify method signatures.
- Added `FluidError` for structured error handling.
- Deprecated original functions `navier_stokes_time_derivative` and `euler_time_derivative`, reimplementing them as wrappers for backward compatibility.
- Added unit tests for new strategies.

This refactor resolves an OCP violation where adding new physics models required modifying the core conservation module.

Co-authored-by: google-labs-jules[bot] <161369871+google-labs-jules[bot]@users.noreply.github.com>
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