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 `///`).

compass_app/app/lib/ui/results/view_models/results_viewmodel.dart

@@ -67,13 +67,12 @@ class ResultsViewModel extends ChangeNotifier {
       case Ok():
         {
           // If the result is Ok, update the list of destinations
-          _destinations =
-              result.value
-                  .where(
-                    (destination) =>
-                        destination.continent == _itineraryConfig!.continent,
-                  )
-                  .toList();
+          _destinations = result.value
+              .where(
+                (destination) =>
+                    destination.continent == _itineraryConfig!.continent,
+              )
+              .toList();
           _log.fine('Destinations (${_destinations.length}) loaded');
         }
       case Error():