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/resources/repos/wolfram/test_repo/lib/helper.wl

@@ -0,0 +1,3 @@
+sayHello[name_String] := StringJoin["Hello, ", name, "!"]
+
+formatResult[value_] := StringJoin["Result: ", ToString[value]]

test/resources/repos/wolfram/test_repo/main.wl

@@ -0,0 +1,17 @@
+Get["lib/helper.wl"]
+
+calculateSum[a_, b_] := a + b
+
+processData[data_List] := Module[{result},
+    result = Total[data];
+    formatResult[result]
+]
+
+main[] := Module[{result, greeting},
+    result = calculateSum[5, 3];
+    greeting = sayHello["World"];
+    Print[greeting];
+    Print[result]
+]
+
+main[]