SIMD Refactor: Merge simd-dev into dev (#55)

Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>
Co-authored-by: aider (openrouter/anthropic/claude-sonnet-4) <aider@aider.chat>
Co-authored-by: Warp <agent@warp.dev>

.gitattributes

@@ -0,0 +1,39 @@
+# Git Line Ending Configuration for QuanTAlib
+
+# Default behavior: let Git normalize line endings to LF on checkin
+* text=auto eol=lf
+
+# Config files must always use LF (cross-platform compatibility)
+*.yaml text eol=lf
+*.yml text eol=lf
+*.json text eol=lf
+*.xml text eol=lf
+*.toml text eol=lf
+*.md text eol=lf
+*.editorconfig text eol=lf
+
+# Shell scripts must always use LF
+*.sh text eol=lf
+
+# C# source files use LF
+*.cs text eol=lf
+*.csproj text eol=lf
+*.props text eol=lf
+*.targets text eol=lf
+*.sln text eol=lf
+
+# Windows-specific files use CRLF
+*.bat text eol=crlf
+*.cmd text eol=crlf
+*.ps1 text eol=crlf
+
+# Binary files
+*.png binary
+*.jpg binary
+*.jpeg binary
+*.gif binary
+*.ico binary
+*.dll binary
+*.exe binary
+*.snupkg binary
+*.nupkg binary