[ENH] Add support for finite-fault scalar field handling

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Introduces finite-fault scalar fields in interpolation workflows with conditional inclusion based on environment variables. Adds new data structures, methods for scalar field computation, and integration with stack outputs and raw arrays. Updates fault stack wiring, test cases for scalar validation, and introduces finite_fault_scalar value type. Refactors relevant methods to handle scalar field serialization and dense grid operations.

[Leguark]

• [ENH] Add octree refinement modes, diagnostics, and support stencils with tests #100
• [ENH] Improve finite-fault and grid scalar handling with backend adjustments and test updates #99
• [ENH] Add tests and example model for finite-fault handling with diagnostics #98
• [ENH] Add support for finite-fault scalar field handling #97 👈 (View in Graphite)
• [ENH] Add finite-fault support to server schema, validation, and PyTorch backend #96
• [ENH] Wire finite-fault definitions into fault stack interpolation #93 : 1 other dependent PR (#94 )
• [ENH] Refactor project_points_onto_surface for robustness and nonlinear projection support #92
• [ENH] Introduce FiniteFault model with validation, serialization, and spline taper support #91
• [FIX] Ensure tensors consistently move to backend device and add tests for GPU-specific behavior #90
• Added a comprehensive technical implementation report for the Multiscale Anisotropic Field Deformation framework. Describes methodology, GPU-accelerated execution via PyKeOps, and dual-criteria octree subdivision for efficient and precise geological model #95
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Merge activity

• Sep 5, 9:11 AM UTC: A user started a stack merge that includes this pull request via Graphite.
• Sep 5, 9:32 AM UTC: Graphite couldn't merge this pull request because a downstack PR [ENH] Introduce FiniteFault model with validation, serialization, and spline taper support #91 failed to merge.