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 `///`).

platform_channels/lib/src/add_pet_details.dart

@@ -31,7 +31,10 @@ class _AddPetDetailsState extends State<AddPetDetails> {
             icon: const Icon(Icons.add),
             onPressed: () {
               PetListMessageChannel.addPetDetails(
-                PetDetails(petType: petType, breed: breedTextController.text),
+                PetDetails(
+                  petType: petType,
+                  breed: breedTextController.text,
+                ),
               );
 
               context.pop();
@@ -61,8 +64,14 @@ class _AddPetDetailsState extends State<AddPetDetails> {
                 ),
               ),
               const SizedBox(height: 8),
-              RadioListTile<String>(title: const Text('Dog'), value: 'Dog'),
-              RadioListTile<String>(title: const Text('Cat'), value: 'Cat'),
+              RadioListTile<String>(
+                title: const Text('Dog'),
+                value: 'Dog',
+              ),
+              RadioListTile<String>(
+                title: const Text('Cat'),
+                value: 'Cat',
+              ),
             ],
           ),
         ),

platform_channels/lib/src/counter_method_channel.dart

@@ -11,7 +11,9 @@ class Counter {
   /// Creates a [MethodChannel] with the specified name to invoke platform method.
   /// In order to communicate across platforms, the name of MethodChannel
   /// should be same on native and dart side.
-  static MethodChannel methodChannel = const MethodChannel('methodChannelDemo');
+  static MethodChannel methodChannel = const MethodChannel(
+    'methodChannelDemo',
+  );
 
   /// This method is responsible to increment and return the value of count.
   static Future<int> increment({required int counterValue}) async {

platform_channels/lib/src/image_basic_message_channel.dart

@@ -15,7 +15,8 @@ class PlatformImageFetcher {
 
   /// Method responsible for providing the platform image.
   static Future<Uint8List> getImage() async {
-    final reply = await _basicMessageChannel.send('getImage') as Uint8List?;
+    final reply =
+        await _basicMessageChannel.send('getImage') as Uint8List?;
     if (reply == null) {
       throw PlatformException(
         code: 'Error',

platform_channels/lib/src/method_channel_demo.dart

@@ -39,7 +39,9 @@ class _MethodChannelDemoState extends State<MethodChannelDemo> {
               FilledButton.icon(
                 onPressed: () async {
                   try {
-                    final value = await Counter.increment(counterValue: count);
+                    final value = await Counter.increment(
+                      counterValue: count,
+                    );
                     setState(() => count = value);
                   } catch (error) {
                     if (!context.mounted) return;
@@ -58,7 +60,9 @@ class _MethodChannelDemoState extends State<MethodChannelDemo> {
               FilledButton.icon(
                 onPressed: () async {
                   try {
-                    final value = await Counter.decrement(counterValue: count);
+                    final value = await Counter.decrement(
+                      counterValue: count,
+                    );
                     setState(() => count = value);
                   } catch (error) {
                     if (!context.mounted) return;

platform_channels/lib/src/pet_list_message_channel.dart

@@ -34,7 +34,9 @@ class PetListMessageChannel {
   /// we will throw a [PlatformException].
   static Future<void> removePet(int index) async {
     final uInt8List = utf8.encoder.convert(index.toString());
-    final reply = await _binaryCodecChannel.send(uInt8List.buffer.asByteData());
+    final reply = await _binaryCodecChannel.send(
+      uInt8List.buffer.asByteData(),
+    );
     if (reply == null) {
       throw PlatformException(
         code: 'INVALID INDEX',

platform_channels/lib/src/pet_list_screen.dart

@@ -56,10 +56,9 @@ class _PetListScreenState extends State<PetListScreen> {
           context.go('/petListScreen/addPetDetails');
         },
       ),
-      body:
-          petListModel.petList.isEmpty
-              ? const Center(child: Text('Enter Pet Details'))
-              : BuildPetList(petListModel.petList),
+      body: petListModel.petList.isEmpty
+          ? const Center(child: Text('Enter Pet Details'))
+          : BuildPetList(petListModel.petList),
     );
   }
 }

platform_channels/lib/src/platform_image_demo.dart

@@ -45,7 +45,10 @@ class _PlatformImageDemoState extends State<PlatformImageDemo> {
                       );
                     } else if (snapshot.connectionState ==
                         ConnectionState.done) {
-                      return Image.memory(snapshot.data!, fit: BoxFit.fill);
+                      return Image.memory(
+                        snapshot.data!,
+                        fit: BoxFit.fill,
+                      );
                     }
                     return const CircularProgressIndicator();
                   },
@@ -54,14 +57,13 @@ class _PlatformImageDemoState extends State<PlatformImageDemo> {
             ),
             const SizedBox(height: 16),
             FilledButton(
-              onPressed:
-                  imageData != null
-                      ? null
-                      : () {
-                        setState(() {
-                          imageData = PlatformImageFetcher.getImage();
-                        });
-                      },
+              onPressed: imageData != null
+                  ? null
+                  : () {
+                      setState(() {
+                        imageData = PlatformImageFetcher.getImage();
+                      });
+                    },
               child: const Text('Get Image'),
             ),
           ],