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>

test/conftest.py

@@ -492,6 +492,15 @@ def _determine_disabled_language_servers() -> list[LanguageServerId]:
     if is_ci:
         result.append(LanguageServerId.KOTLIN)  # IntelliJ-based Kotlin LSP crashes on JVM restart under CI memory limits
 
+    # Disable Wolfram tests if WolframKernel is not available (checked with the same
+    # discovery logic used by the language server itself)
+    from solidlsp.language_servers.wolfram_language_server import _find_wolfram_kernel
+
+    try:
+        _find_wolfram_kernel()
+    except FileNotFoundError:
+        result.append(LanguageServerId.WOLFRAM)
+
     return result