Dart 3.9 / Flutter 3.35 [first LLM release] (#2714)

I got carried away with Gemini and basically rewrote CI and the release
process for the new LLM reality. This work was largely completed by
Gemini.

- Bump all SDK versions to the current beta (3.9.0-0)
- Run `flutter channel beta`
- Wrote `ci_script.dart` to replace the bash scripts
- Converted repository to pub workspace #2499 
- Added llm.md and release.md
- Added redirect for deprecated Samples Index

## Pre-launch Checklist

- [x] I read the [Flutter Style Guide] _recently_, and have followed its
advice.
- [x] I signed the [CLA].
- [x] I read the [Contributors Guide].
- [x] I have added sample code updates to the [changelog].
- [x] I updated/added relevant documentation (doc comments with `///`).

deeplink_store_example/lib/main.dart

@@ -33,14 +33,14 @@ class MyApp extends StatelessWidget {
         routes: [
           GoRoute(
             path: '/',
-            builder: (_, __) => const ProductList(),
+            builder: (_, _) => const ProductList(),
             routes: [
-              GoRoute(path: ':id', builder: (_, __) => const ProductDetails()),
+              GoRoute(path: ':id', builder: (_, _) => const ProductDetails()),
             ],
           ),
           GoRoute(
             path: '/category/:category',
-            builder: (_, __) => const ProductCategoryList(),
+            builder: (_, _) => const ProductCategoryList(),
           ),
         ],
       ),

deeplink_store_example/lib/product_category_list.dart

@@ -30,10 +30,9 @@ class ProductCategoryList extends StatelessWidget {
           value.toString().contains(state.pathParameters['category']!),
       orElse: () => Category.all,
     );
-    final List<Widget> children =
-        ProductsRepository.loadProducts(
-          category: category,
-        ).map<Widget>((Product p) => RowItem(product: p)).toList();
+    final List<Widget> children = ProductsRepository.loadProducts(
+      category: category,
+    ).map<Widget>((Product p) => RowItem(product: p)).toList();
     return Scaffold(
       backgroundColor: Styles.scaffoldBackground,
       body: CustomScrollView(

deeplink_store_example/lib/product_list.dart

@@ -23,10 +23,9 @@ class ProductList extends StatelessWidget {
 
   @override
   Widget build(BuildContext context) {
-    final List<Widget> children =
-        ProductsRepository.loadProducts()
-            .map<Widget>((Product p) => RowItem(product: p))
-            .toList();
+    final List<Widget> children = ProductsRepository.loadProducts()
+        .map<Widget>((Product p) => RowItem(product: p))
+        .toList();
     return Scaffold(
       backgroundColor: Styles.scaffoldBackground,
       body: CustomScrollView(

deeplink_store_example/pubspec.yaml

@@ -1,5 +1,8 @@
 name: deeplink_store_example
 description: A new Flutter project.
+version: 1.0.0+1
+resolution: workspace
+
 # The following line prevents the package from being accidentally published to
 # pub.dev using `flutter pub publish`. This is preferred for private packages.
 publish_to: 'none' # Remove this line if you wish to publish to pub.dev
@@ -16,10 +19,10 @@ publish_to: 'none' # Remove this line if you wish to publish to pub.dev
 # https://developer.apple.com/library/archive/documentation/General/Reference/InfoPlistKeyReference/Articles/CoreFoundationKeys.html
 # In Windows, build-name is used as the major, minor, and patch parts
 # of the product and file versions while build-number is used as the build suffix.
-version: 1.0.0+1
+
 
 environment:
-  sdk: ^3.7.0-0
+  sdk: ^3.9.0-0
 
 # Dependencies specify other packages that your package needs in order to work.
 # To automatically upgrade your package dependencies to the latest versions
@@ -31,23 +34,23 @@ dependencies:
   flutter:
     sdk: flutter
 
-
   # The following adds the Cupertino Icons font to your application.
   # Use with the CupertinoIcons class for iOS style icons.
   cupertino_icons: ^1.0.2
   shrine_images: ^2.0.2
-  go_router: ^16.1.0
+  go_router: ^16.0.0
 
 dev_dependencies:
+  analysis_defaults:
+    path: ../analysis_defaults
   flutter_test:
     sdk: flutter
-
   # The "flutter_lints" package below contains a set of recommended lints to
   # encourage good coding practices. The lint set provided by the package is
   # activated in the `analysis_options.yaml` file located at the root of your
   # package. See that file for information about deactivating specific lint
   # rules and activating additional ones.
-  flutter_lints: ^5.0.0
+  flutter_lints: ^6.0.0
 
 # For information on the generic Dart part of this file, see the
 # following page: https://dart.dev/tools/pub/pubspec