feat: add c language compatibility

tests/lib/install-manifests.test.js

@@ -74,6 +74,8 @@ function runTests() {
     const components = listInstallComponents();
     assert.ok(components.some(component => component.id === 'lang:typescript'),
       'Should include lang:typescript');
+    assert.ok(components.some(component => component.id === 'lang:c'),
+      'Should include lang:c');
     assert.ok(components.some(component => component.id === 'capability:security'),
       'Should include capability:security');
   })) passed++; else failed++;
@@ -87,6 +89,7 @@ function runTests() {
     assert.ok(languages.includes('kotlin'));
     assert.ok(languages.includes('rust'));
     assert.ok(languages.includes('cpp'));
+    assert.ok(languages.includes('c'));
     assert.ok(languages.includes('csharp'));
   })) passed++; else failed++;
 
@@ -183,6 +186,17 @@ function runTests() {
       'cpp should resolve to framework-language module');
   })) passed++; else failed++;
 
+  if (test('resolves c legacy compatibility into framework-language module', () => {
+    const selection = resolveLegacyCompatibilitySelection({
+      target: 'cursor',
+      legacyLanguages: ['c'],
+    });
+
+    assert.ok(selection.moduleIds.includes('rules-core'));
+    assert.ok(selection.moduleIds.includes('framework-language'),
+      'c should resolve to framework-language module');
+  })) passed++; else failed++;
+
   if (test('resolves csharp legacy compatibility into framework-language module', () => {
     const selection = resolveLegacyCompatibilitySelection({
       target: 'cursor',

tests/lib/project-detect.test.js

@@ -220,6 +220,20 @@ function runTests() {
     }
   })) passed++; else failed++;
 
+  console.log('\nC Detection:');
+
+  if (test('detects c from top-level .c files', () => {
+    const dir = createTempDir();
+    try {
+      writeTestFile(dir, 'main.c', 'int main(void) { return 0; }\n');
+      const result = detectProjectType(dir);
+      assert.ok(result.languages.includes('c'));
+      assert.strictEqual(result.primary, 'c');
+    } finally {
+      cleanupDir(dir);
+    }
+  })) passed++; else failed++;
+
   // Go detection
   console.log('\nGo Detection:');