Add `.luau` to CODE_EXTENSIONS and route it through extract_lua
(tree-sitter-lua). Roblox first-party code uses .luau; without this,
graphify silently skipped 379/479 files on a real Roblox codebase
and the resulting graph was dominated by vendored .lua dependencies.
tree-sitter-lua doesn't parse Luau type annotations, but it
successfully extracts function declarations and call edges from
Luau source — verified on a 379-file Roblox codebase (1265 nodes,
1471 edges, 236 communities).
A dedicated tree-sitter-luau grammar would be a richer long-term
fix; this is the minimal change to make Luau projects work today.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
daleardi