docs: salvage F# agent and language guidance

tests/lib/install-manifests.test.js

@@ -179,6 +179,7 @@ function runTests() {
     assert.ok(languages.includes('cpp'));
     assert.ok(languages.includes('c'));
     assert.ok(languages.includes('csharp'));
+    assert.ok(languages.includes('fsharp'));
   })) passed++; else failed++;
 
   if (test('resolves a real project profile with target-specific skips', () => {
@@ -420,6 +421,17 @@ function runTests() {
       'csharp should resolve to framework-language module');
   })) passed++; else failed++;
 
+  if (test('resolves fsharp legacy compatibility into framework-language module', () => {
+    const selection = resolveLegacyCompatibilitySelection({
+      target: 'cursor',
+      legacyLanguages: ['fsharp'],
+    });
+
+    assert.ok(selection.moduleIds.includes('rules-core'));
+    assert.ok(selection.moduleIds.includes('framework-language'),
+      'fsharp should resolve to framework-language module');
+  })) passed++; else failed++;
+
   if (test('keeps antigravity legacy compatibility selections target-safe', () => {
     const selection = resolveLegacyCompatibilitySelection({
       target: 'antigravity',

tests/lib/project-detect.test.js

@@ -234,6 +234,21 @@ function runTests() {
     }
   })) passed++; else failed++;
 
+  console.log('\nF# Detection:');
+
+  if (test('detects fsharp from project and source files', () => {
+    const dir = createTempDir();
+    try {
+      writeTestFile(dir, 'App.fsproj', '<Project Sdk="Microsoft.NET.Sdk"></Project>');
+      writeTestFile(dir, 'Program.fs', 'printfn "hello"\n');
+      const result = detectProjectType(dir);
+      assert.ok(result.languages.includes('fsharp'));
+      assert.strictEqual(result.primary, 'fsharp');
+    } finally {
+      cleanupDir(dir);
+    }
+  })) passed++; else failed++;
+
   // Go detection
   console.log('\nGo Detection:');