SwiftX 1.0.0

First release. Native-Swift, dependency-free reader for DirectX .x geometry — all four flavours (text, binary, MSZip-compressed text/binary; 32+64-bit floats). Vertices + fan-triangulated faces across every Mesh. Options for welding, degenerate-face culling, scale, and handedness. Validated bbox-exact vs Assimp on a 116-file RailSim corpus. Linux + Apple.