chore: bump cursor_templates_version to 1.0.4 and update related files

- Updated cursor_templates_version in project-brief.yaml to 1.0.4 for reproducibility.
- Enhanced CHANGELOG with fixes and features for version 1.0.4, including improved template resolution for global installs.
- Updated pubspec.yaml and VERSION file to reflect the new version.
- Added new templates for AGENTS.md and lefthook.yaml to the generator.
- Adjusted tests to include new root-level files in the output.

This release addresses template resolution issues and introduces new repo-level configuration files.

flutter-cursor-templates/generator/src/resolver.dart

@@ -94,6 +94,8 @@ class Resolver {
       files.add('agents/migration-agent');
     }
 
+    files.addAll(['root/AGENTS.md', 'root/lefthook.yaml']);
+
     return files;
   }
 
@@ -127,6 +129,7 @@ class Resolver {
     if (key == 'skills/build')           return 'Always included — universal TDD-first feature implementation command';
     if (key.contains('api-client'))     return 'api_docs.format is set';
     if (key.contains('realtime'))       return 'features.special contains realtime';
+    if (key.startsWith('root/'))        return 'Repo-level companion files';
     return 'Included';
   }
 }