feat(format): Enhance format module with rollback, diff reporting, and improved parallel execution

ts/mod_format/format.packagejson.ts

@@ -13,7 +13,56 @@ const ensureDependency = async (
   position: 'dep' | 'devDep' | 'everywhere',
   constraint: 'exclude' | 'include' | 'latest',
   dependencyArg: string,
-) => {};
+) => {
+  const [packageName, version] = dependencyArg.includes('@')
+    ? dependencyArg.split('@').filter(Boolean)
+    : [dependencyArg, 'latest'];
+
+  const targetSections: string[] = [];
+  
+  switch (position) {
+    case 'dep':
+      targetSections.push('dependencies');
+      break;
+    case 'devDep':
+      targetSections.push('devDependencies');
+      break;
+    case 'everywhere':
+      targetSections.push('dependencies', 'devDependencies');
+      break;
+  }
+
+  for (const section of targetSections) {
+    if (!packageJsonObjectArg[section]) {
+      packageJsonObjectArg[section] = {};
+    }
+
+    switch (constraint) {
+      case 'exclude':
+        delete packageJsonObjectArg[section][packageName];
+        break;
+      case 'include':
+        if (!packageJsonObjectArg[section][packageName]) {
+          packageJsonObjectArg[section][packageName] = version === 'latest' ? '^1.0.0' : version;
+        }
+        break;
+      case 'latest':
+        // Fetch latest version from npm
+        try {
+          const registry = new plugins.smartnpm.NpmRegistry();
+          const packageInfo = await registry.getPackageInfo(packageName);
+          const latestVersion = packageInfo['dist-tags'].latest;
+          packageJsonObjectArg[section][packageName] = `^${latestVersion}`;
+        } catch (error) {
+          logger.log('warn', `Could not fetch latest version for ${packageName}, using existing or default`);
+          if (!packageJsonObjectArg[section][packageName]) {
+            packageJsonObjectArg[section][packageName] = version === 'latest' ? '^1.0.0' : version;
+          }
+        }
+        break;
+    }
+  }
+};
 
 export const run = async (projectArg: Project) => {
   const formatStreamWrapper = new plugins.smartstream.StreamWrapper([