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 `///`).

code_sharing/client/pubspec.yaml

@@ -2,9 +2,10 @@ name: client
 description: A Flutter app which communicates with a Dart backend using shared business logic.
 publish_to: "none"
 version: 1.0.0+1
+resolution: workspace
 
 environment:
-  sdk: ^3.7.0-0
+  sdk: ^3.9.0-0
 
 dependencies:
   cupertino_icons: ^1.0.2
@@ -15,7 +16,9 @@ dependencies:
     path: ../shared
 
 dev_dependencies:
-  flutter_lints: ^5.0.0
+  analysis_defaults:
+    path: ../../analysis_defaults
+  flutter_lints: ^6.0.0
   flutter_test:
     sdk: flutter
 

code_sharing/server/bin/server.dart

@@ -9,10 +9,9 @@ import 'package:shelf_router/shelf_router.dart';
 int count = 0;
 
 // Configure routes.
-final _router =
-    Router()
-      ..post('/', _incrementHandler)
-      ..get('/', _getValueHandler);
+final _router = Router()
+  ..post('/', _incrementHandler)
+  ..get('/', _getValueHandler);
 
 Future<Response> _incrementHandler(Request request) async {
   final incr = Increment.fromJson(json.decode(await request.readAsString()));

code_sharing/server/pubspec.yaml

@@ -2,9 +2,10 @@ name: server
 description: A server app using the shelf package and Docker.
 version: 1.0.0
 publish_to: "none"
+resolution: workspace
 
 environment:
-  sdk: ^3.7.0-0
+  sdk: ^3.9.0-0
 
 dependencies:
   args: ^2.0.0
@@ -14,6 +15,8 @@ dependencies:
     path: ../shared
 
 dev_dependencies:
+  analysis_defaults:
+    path: ../../analysis_defaults
   http: ^1.0.0
   lints: ^6.0.0
   test: ^1.15.0

code_sharing/shared/lib/src/models.freezed.dart

@@ -52,11 +52,10 @@ class _$IncrementCopyWithImpl<$Res, $Val extends Increment>
   $Res call({Object? by = null}) {
     return _then(
       _value.copyWith(
-            by:
-                null == by
-                    ? _value.by
-                    : by // ignore: cast_nullable_to_non_nullable
-                        as int,
+            by: null == by
+                ? _value.by
+                : by // ignore: cast_nullable_to_non_nullable
+                      as int,
           )
           as $Val,
     );
@@ -89,11 +88,10 @@ class __$$IncrementImplCopyWithImpl<$Res>
   $Res call({Object? by = null}) {
     return _then(
       _$IncrementImpl(
-        by:
-            null == by
-                ? _value.by
-                : by // ignore: cast_nullable_to_non_nullable
-                    as int,
+        by: null == by
+            ? _value.by
+            : by // ignore: cast_nullable_to_non_nullable
+                  as int,
       ),
     );
   }
@@ -189,11 +187,10 @@ class _$CountCopyWithImpl<$Res, $Val extends Count>
   $Res call({Object? value = null}) {
     return _then(
       _value.copyWith(
-            value:
-                null == value
-                    ? _value.value
-                    : value // ignore: cast_nullable_to_non_nullable
-                        as int,
+            value: null == value
+                ? _value.value
+                : value // ignore: cast_nullable_to_non_nullable
+                      as int,
           )
           as $Val,
     );
@@ -228,7 +225,7 @@ class __$$CountImplCopyWithImpl<$Res>
         null == value
             ? _value.value
             : value // ignore: cast_nullable_to_non_nullable
-                as int,
+                  as int,
       ),
     );
   }

code_sharing/shared/pubspec.yaml

@@ -1,15 +1,18 @@
 name: shared
 description: Common data models required by our client and server
 version: 1.0.0
+resolution: workspace
 
 environment:
-  sdk: ^3.7.0-0
+  sdk: ^3.9.0-0
 
 dependencies:
   freezed_annotation: ">=2.1.0 <4.0.0"
   json_annotation: ^4.7.0
 
 dev_dependencies:
+  analysis_defaults:
+    path: ../../analysis_defaults
   build_runner: ^2.2.1
   freezed: ">=2.1.1 <4.0.0"
   json_serializable: ^6.4.0