fix: generate root barrel file in multi-target codegen

generateMulti() was generating per-target barrel files (admin/index.ts,
auth/index.ts, etc.) but never creating the root src/index.ts that
re-exports all targets as namespaces. The pregenerate script deletes
src/index.ts via rimraf, and the codegen never recreated it, causing
downstream packages like @constructive-io/node to fail with
TS2307: Cannot find module '@constructive-io/sdk'.

Adds generateMultiTargetBarrel() which creates:
  export * as admin from './admin';
  export * as auth from './auth';
  export * as public_ from './public';  // reserved word alias

Called from generateMulti() after all targets complete.

Author: pyramation

graphql/codegen/src/core/codegen/barrel.ts

@@ -230,6 +230,59 @@ export function generateRootBarrel(options: RootBarrelOptions = {}): string {
   return generateCode(statements);
 }
 
+// ============================================================================
+// Multi-target root barrel (re-exports each target as a namespace)
+// ============================================================================
+
+/** JS reserved words that need an alias when used as export names */
+const JS_RESERVED = new Set([
+  'abstract', 'arguments', 'await', 'boolean', 'break', 'byte', 'case', 'catch',
+  'char', 'class', 'const', 'continue', 'debugger', 'default', 'delete', 'do',
+  'double', 'else', 'enum', 'eval', 'export', 'extends', 'false', 'final',
+  'finally', 'float', 'for', 'function', 'goto', 'if', 'implements', 'import',
+  'in', 'instanceof', 'int', 'interface', 'let', 'long', 'native', 'new',
+  'null', 'package', 'private', 'protected', 'public', 'return', 'short',
+  'static', 'super', 'switch', 'synchronized', 'this', 'throw', 'throws',
+  'transient', 'true', 'try', 'typeof', 'var', 'void', 'volatile', 'while',
+  'with', 'yield',
+]);
+
+/**
+ * Generate a root index.ts for multi-target output that re-exports each
+ * target as a namespace.
+ *
+ * Example output:
+ *   export * as admin from './admin';
+ *   export * as auth from './auth';
+ *   export * as public_ from './public';
+ */
+export function generateMultiTargetBarrel(targetNames: string[]): string {
+  const statements: t.Statement[] = [];
+
+  for (const name of targetNames) {
+    const alias = JS_RESERVED.has(name) ? `${name}_` : name;
+    const exportDecl = t.exportNamedDeclaration(
+      null,
+      [t.exportNamespaceSpecifier(t.identifier(alias))],
+      t.stringLiteral(`./${name}`),
+    );
+    statements.push(exportDecl);
+  }
+
+  if (statements.length > 0) {
+    addJSDocComment(statements[0], [
+      '@constructive-io/sdk',
+      '',
+      'Auto-generated GraphQL types and ORM client.',
+      'Run `pnpm run generate` to populate this package from the schema files.',
+      '',
+      '@generated by @constructive-io/graphql-codegen',
+    ]);
+  }
+
+  return generateCode(statements);
+}
+
 // ============================================================================
 // Custom operation barrels (includes both table and custom hooks)
 // ============================================================================

graphql/codegen/src/core/generate.ts

@@ -18,7 +18,7 @@ import type { CliConfig, DbConfig, GraphQLSDKConfigTarget, PgpmConfig, SchemaCon
 import { getConfigOptions } from '../types/config';
 import type { Operation, Table, TypeRegistry } from '../types/schema';
 import { generate as generateReactQueryFiles } from './codegen';
-import { generateRootBarrel } from './codegen/barrel';
+import { generateRootBarrel, generateMultiTargetBarrel } from './codegen/barrel';
 import { generateCli as generateCliFiles, generateMultiTargetCli } from './codegen/cli';
 import type { MultiTargetCliTarget } from './codegen/cli';
 import {
@@ -827,16 +827,35 @@ export async function generateMulti(
     }
   }
 
-  // Generate root-root README if multi-target
+  // Generate root-root README and barrel if multi-target
   if (names.length > 1 && targetInfos.length > 0 && !dryRun) {
-    const rootReadme = generateRootRootReadme(targetInfos);
     const { writeGeneratedFiles: writeFiles } = await import('./output');
+
+    const rootReadme = generateRootRootReadme(targetInfos);
     await writeFiles(
       [{ path: rootReadme.fileName, content: rootReadme.content }],
       '.',
       [],
       { pruneStaleFiles: false },
     );
+
+    // Write a root barrel (index.ts) that re-exports each target as a
+    // namespace so the package has a single entry-point.  Derive the
+    // common output root from the first target's output path.
+    const successfulNames = results
+      .filter((r) => r.result.success)
+      .map((r) => r.name);
+    if (successfulNames.length > 0) {
+      const firstOutput = getConfigOptions(configs[successfulNames[0]]).output;
+      const outputRoot = path.dirname(firstOutput);
+      const barrelContent = generateMultiTargetBarrel(successfulNames);
+      await writeFiles(
+        [{ path: 'index.ts', content: barrelContent }],
+        outputRoot,
+        [],
+        { pruneStaleFiles: false },
+      );
+    }
   }
 
   } finally {