chore: remove legacy config rewriting, dead code branches, and unused public exports

src/cli/commands/migrate/index.ts

@@ -25,15 +25,8 @@
 import { readFileSync, writeFileSync, existsSync } from 'node:fs';
 import { resolve } from 'node:path';
 import type { CliContext } from '../../core/context.js';
-import { loadConfig, discoverConfig } from '../../core/config-loader.js';
+import { discoverConfig } from '../../core/config-loader.js';
 import { SUCCESS, USAGE_ERROR, BEHAVIORAL_FAILURE } from '../../core/exit-codes.js';
-import type { CommandResult } from '../../core/types.js';
-import {
-  rewriteConfigFile,
-  detectLegacyConfigFields,
-  detectLegacyFieldsNoEquivalent,
-  detectMixedLegacyModernFields,
-} from './rewriters/config-rewriter.js';
 import {
   rewriteRouteAnnotations,
   detectLegacyRouteAnnotations,
@@ -136,11 +129,8 @@ export async function detectAllLegacyPatterns(
 ): Promise<MigrationItem[]> {
   const items: MigrationItem[] = [];
 
-  // Detect config fields
   if (configFile && existsSync(configFile)) {
     const configContent = readFileSync(configFile, 'utf-8');
-    items.push(...detectLegacyConfigFields(configContent, configFile));
-    items.push(...detectLegacyFieldsNoEquivalent(configContent, configFile));
     items.push(...detectLegacyRouteAnnotations(configContent, configFile));
     items.push(...detectAmbiguousRoutePatterns(configContent, configFile));
     items.push(...detectLegacyCodePatterns(configContent, configFile));
@@ -276,25 +266,8 @@ export async function migrateCommand(
     const completed: MigrationItem[] = [];
     const remaining: MigrationItem[] = [];
 
-    // Rewrite config file
+    // Route annotations in config file
     if (configFile && existsSync(configFile)) {
-      const configItems = unambiguousItems.filter(
-        (item) => item.file === configFile && item.type === 'config-field',
-      );
-
-      if (configItems.length > 0) {
-        const result = rewriteConfigFile(configFile, configItems);
-        if (result.modified) {
-          writeFileSync(configFile, result.content, 'utf-8');
-          filesModified.push(configFile);
-          completed.push(...result.itemsRewritten);
-          remaining.push(...result.itemsRemaining);
-        } else {
-          remaining.push(...configItems);
-        }
-      }
-
-      // Route annotations in config file
       const routeItems = unambiguousItems.filter(
         (item) => item.file === configFile && item.type === 'route-annotation',
       );