AetherCoreEngine v1.0.0 — Zero-Dependency 3D Spectral Path Tracer, Fluid Solver & 24-Bit Audio Engine

Initial v1.0.0 release of AetherCoreEngine: pure standard-library Rust 3D hero-wavelength spectral path tracer (SAH BVH, Triangles/Spheres/CSG SDFs, Dielectric/Conductor GGX VNDF/Subsurface Isotropic Scattering, NEE MIS, ACES Filmic, custom LZ77+Huffman PNG encoder), coupled 3D staggered-MAC Navier-Stokes fluid & vorticity confinement solver (MacCormack advection, CG & Red-Black SOR Gauss-Seidel Poisson projection, Woodcock delta tracking & ratio tracking), and 15s 48kHz 24-bit stereo procedural synthesizer (4-op FM bells, 4-pole ZDF TPT SVF, 8-line Hadamard FDN reverb).