feat: add c language compatibility

AGENTS.md

@@ -25,8 +25,8 @@ This is a **production-ready AI coding plugin** providing 47 specialized agents,
 | e2e-runner | End-to-end Playwright testing | Critical user flows |
 | refactor-cleaner | Dead code cleanup | Code maintenance |
 | doc-updater | Documentation and codemaps | Updating docs |
-| cpp-reviewer | C++ code review | C++ projects |
+| cpp-reviewer | C/C++ code review | C and C++ projects |
-| cpp-build-resolver | C++ build errors | C++ build failures |
+| cpp-build-resolver | C/C++ build errors | C and C++ build failures |
 | docs-lookup | Documentation lookup via Context7 | API/docs questions |
 | go-reviewer | Go code review | Go projects |
 | go-build-resolver | Go build errors | Go build failures |

manifests/install-components.json

@@ -193,6 +193,14 @@
         "framework-language"
       ]
     },
+    {
+      "id": "lang:c",
+      "family": "language",
+      "description": "C engineering guidance using the shared C/C++ standards and testing stack. Currently resolves through the shared framework-language module.",
+      "modules": [
+        "framework-language"
+      ]
+    },
     {
       "id": "lang:kotlin",
       "family": "language",

scripts/lib/install-manifests.js

@@ -37,6 +37,7 @@ const LEGACY_COMPAT_BASE_MODULE_IDS_BY_TARGET = Object.freeze({
   ],
 });
 const LEGACY_LANGUAGE_ALIAS_TO_CANONICAL = Object.freeze({
+  c: 'c',
   cpp: 'cpp',
   csharp: 'csharp',
   go: 'go',
@@ -52,6 +53,7 @@ const LEGACY_LANGUAGE_ALIAS_TO_CANONICAL = Object.freeze({
   typescript: 'typescript',
 });
 const LEGACY_LANGUAGE_EXTRA_MODULE_IDS = Object.freeze({
+  c: ['framework-language'],
   cpp: ['framework-language'],
   csharp: ['framework-language'],
   go: ['framework-language'],

scripts/lib/project-detect.js

@@ -50,6 +50,11 @@ const LANGUAGE_RULES = [
     markers: ['pom.xml', 'build.gradle', 'build.gradle.kts'],
     extensions: ['.java']
   },
+  {
+    type: 'c',
+    markers: [],
+    extensions: ['.c']
+  },
   {
     type: 'csharp',
     markers: [],

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:');