chore: update README and CLI usage for cursor_gen, version bump to 1.0.1

- Changed CLI usage instructions from `dart run cursor_gen` to `cursor_gen` for global activation.
- Updated project-brief.yaml example and README to reflect new command usage.
- Added app_context section in project-brief.yaml for theme variants and RBAC roles.
- Fixed bundled template resolution for local and global installs to prevent 'Template not found' errors.
- Version bump to 1.0.1 with corresponding updates in CHANGELOG and pubspec.yaml.

flutter-cursor-templates/generator/templates/hooks/hooks.json.tmpl

@@ -0,0 +1,19 @@
+{
+  "hooks": [
+    {
+      "name": "pre-commit: flutter analyze",
+      "command": "npx ts-node .cursor/hooks/flutter-analyze.ts",
+      "events": ["pre-commit"]
+    },
+    {
+      "name": "pre-commit: arch guard",
+      "command": "npx ts-node .cursor/hooks/arch-guard.ts",
+      "events": ["pre-commit"]
+    },
+    {
+      "name": "pre-push: run tests",
+      "command": "npx ts-node .cursor/hooks/grind-tests.ts",
+      "events": ["pre-push"]
+    }
+  ]
+}