build: Remove bash dependency from melos format scripts

Replace bash -c conditionals with plain `dart format .` which
formats the entire package directory without needing a shell wrapper.
Also fix incorrect barrel file reference in flutter AGENTS.md.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: buenaflor

melos.yaml

@@ -35,13 +35,13 @@ scripts:
       dirExists: lib
 
   format:
-    run: melos exec -- bash -c 'dart format lib $([ -d test ] && echo test)'
+    run: melos exec -- dart format .
     description: Apply formatting to all packages.
     packageFilters:
       dirExists: lib
 
   format:check:
-    run: melos exec --fail-fast -- bash -c 'dart format --set-exit-if-changed lib $([ -d test ] && echo test)'
+    run: melos exec --fail-fast -- dart format --set-exit-if-changed .
     description: Check formatting of all packages.
     packageFilters:
       dirExists: lib

packages/flutter/AGENTS.md

@@ -6,7 +6,7 @@ Flutter SDK with native integrations across all platforms.
 
 `lib/sentry_flutter.dart` is the public barrel file. Changes here affect all downstream packages and users.
 
-- Every new public type must be exported from `lib/sentry.dart`
+- Every new public type must be exported from `lib/sentry_flutter.dart`
 
 ## Native Code