fix: Add .gitattributes for GitHub Linguist language detection

Configure GitHub Linguist to correctly identify repository languages:

Primary language classification:
- *.res, *.resi → ReScript (NOT TypeScript)
- *.tla → TLA+ (formal verification)
- *.rs → Rust (WASM modules)
- *.ncl → Nickel (configuration)
- justfile → Just (build system)

Exclude from language stats:
- *.bs.js files (generated by ReScript compiler)
- .github/workflows (CI configuration)
- docs/, examples/, benchmarks/ (documentation/tooling)

This fixes GitHub incorrectly classifying the repository as TypeScript
when it is actually a 100% ReScript + Rust + Deno codebase with zero
TypeScript files (RSR Rhodium compliant).

Line endings normalized to LF for all text files.

Author: claude

.gitattributes

@@ -0,0 +1,57 @@
+# Fogbinder Language Classification for GitHub Linguist
+# RSR Rhodium Standard Repository - ReScript + WASM + Deno
+
+# ReScript files (primary language)
+*.res linguist-language=ReScript
+*.resi linguist-language=ReScript
+
+# ReScript generated JavaScript files (exclude from stats)
+*.bs.js linguist-generated=true
+
+# TLA+ formal verification specs
+*.tla linguist-language=TLA
+
+# Rust WASM modules
+*.rs linguist-language=Rust
+
+# Deno configuration
+deno.json linguist-language=JSON
+deno.jsonc linguist-language=JSONC
+
+# ReScript configuration
+bsconfig.json linguist-language=JSON
+
+# Nickel configuration language
+*.ncl linguist-language=Nickel
+
+# Justfile build system
+justfile linguist-language=Just
+
+# AsciiDoc documentation
+*.adoc linguist-documentation=true linguist-language=AsciiDoc
+
+# Markdown (exceptions only)
+*.md linguist-documentation=true
+
+# Exclude from language stats
+.github/workflows/*.yml linguist-vendored=true
+docs/* linguist-documentation=true
+examples/* linguist-documentation=true
+benchmarks/* linguist-vendored=true
+scripts/* linguist-vendored=true
+
+# Git LFS (for large assets if needed)
+*.wasm filter=lfs diff=lfs merge=lfs -text
+
+# Line endings
+* text=auto
+*.res text eol=lf
+*.resi text eol=lf
+*.rs text eol=lf
+*.js text eol=lf
+*.json text eol=lf
+*.adoc text eol=lf
+*.md text eol=lf
+*.sh text eol=lf
+*.yml text eol=lf
+*.tla text eol=lf