fix(cursor_gen): satisfy pub publish validation

Add LICENSE (MIT), README, and CHANGELOG for the package root.
Import models.dart in the CLI for OverrideSnapshot.
Wrap tests in main() and add containsNot() helper for analyzer.

Co-authored-by: Cursor <cursoragent@cursor.com>

flutter-cursor-templates/generator/README.md

@@ -0,0 +1,53 @@
+# cursor_gen
+
+CLI that generates project-specific [Cursor](https://cursor.com) AI configuration for Flutter projects from a `project-brief.yaml` file (stack, architecture, routing, backends, testing, and more).
+
+## Requirements
+
+- Dart SDK `>=3.3.0 <4.0.0`
+
+## Install
+
+**From path (local checkout):**
+
+```bash
+dart pub global activate --source path .
+```
+
+Run from the `flutter-cursor-templates/generator` directory (where this `README` lives).
+
+**From Git:** use `dart pub global activate --source git <repo-url>` and set the `path` option if your `pubspec.yaml` is not at the repository root (see [pub dependencies](https://dart.dev/tools/pub/dependencies#git-packages)).
+
+**From a private Pub registry:** configure `dart pub token add` and install with `dart pub add cursor_gen --hosted-url=<your-registry-url>`.
+
+## Usage
+
+```bash
+cursor_gen --help
+cursor_gen --validate --brief project-brief.yaml
+cursor_gen --brief project-brief.yaml --output .cursor
+cursor_gen --refresh   # regenerate while preserving custom/ and CURSOR:CUSTOM blocks
+cursor_gen --wizard    # interactive project-brief.yaml creator
+```
+
+## Minimal `project-brief.yaml`
+
+```yaml
+project:
+  name: MyApp
+  package: com.example.myapp
+  scale: medium
+stack:
+  state_management: bloc
+  architecture: clean
+  routing: gorouter
+  platforms: [ios, android]
+  backend: firebase
+  auth: firebase_auth
+```
+
+Use `brief-schema.json` in this package for IDE validation and autocomplete of the full schema.
+
+## Repository
+
+For full monorepo layout, template library, and architecture notes, see the parent repository README.