Fix interpolation bounds error in RSL profiles (GH#1223)

[sunt05]

Fixes #1223

Adds defensive checks to prevent NaN and invalid values in MOST height generation:

• Validate z_x and height array for NaN before interpolation
• Clamp PAI to valid range [0,1] and protect division by zero
• Fall back to input z0m_in/zdm_in when computed values are invalid
• Ensure minimum height above roughness sublayer for degenerate cases
• Includes regression test for full-building urban grids

[github-actions]

CI Build Plan

Changed Files

Fortran source (2 files)

• src/suews/src/suews_phys_resist.f95
• src/suews/src/suews_phys_rslprof.f95

Rust bridge (1 file)

• src/suews_bridge/build.rs

Tests (1 file)

• test/physics/test_rslprof.py

Build Configuration

	Configuration
Platforms	Linux x86_64, macOS ARM64, Windows x64
Python	3.9, 3.14
Test tier	standard (all except slow)
UMEP build	Yes (compiled extension may differ)
PR status	Ready (standard matrix)

Rationale

• Fortran source changed -> multiplatform build required
• Rust bridge changed -> multiplatform build required
• Test files changed -> validation build
• Compiled extension ABI may differ -> UMEP (NumPy 1.x) build included

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