Add Wolfram Language support via official LSPServer paclet (#1108)

Adds support for Wolfram Language (.wl, .wls files) using the official
WolframResearch LSPServer paclet, which communicates via stdio.
Requires Wolfram Mathematica 13.0+ or Wolfram Engine 12.1+.
The WolframKernel is located via WOLFRAM_PATH, the system PATH, common
install locations, or ls_path in ls_specific_settings.

Includes language server implementation, test repo, test suite
(skipped gracefully when WolframKernel is unavailable), and
documentation updates.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>

docs/01-about/020_programming-languages.md

@@ -177,8 +177,10 @@ Some languages require additional installations or setup steps, as noted.
   globals, which the plain TypeScript language server does not; overlaps `typescript` on file extensions,
   so it is not auto-detected and must be set as the language explicitly — do not also enable `typescript`
   for the same files)
-* **Vue**    
+* **Vue**
   (3.x with TypeScript; requires Node.js v18+ and npm; supports .vue Single File Components with monorepo detection)
+* **Wolfram Language**
+  (requires Wolfram Mathematica 13.0+ or Wolfram Engine 12.1+; uses the official [WolframResearch LSPServer](https://github.com/WolframResearch/LSPServer) paclet; supports .wl and .wls files; references are within-file only)
 * **YAML**
 * **JSON**  
   (experimental; must be explicitly added to the languages list; requires Node.js and npm)