chore(env): update Flutter and SDK constraints for compatibility

- Downgraded Flutter version in .fvmrc from 3.29.3 to 3.27.0 for compatibility with current dependencies
- Raised Dart SDK constraint in benchmark_di/pubspec.yaml from >=3.0.0 <4.0.0 to >=3.2.0 <4.0.0 to align with required package minimums

This change ensures environment compatibility for dependency resolution and build tools. No functional code changes.

melos.yaml

@@ -13,6 +13,20 @@ packages:
   - examples/postly
 
 scripts:
+  all:
+    steps:
+      - codegen
+      - analyze
+      - format
+      - test
+    description: Run all steps.
+
+  lint:all:
+    steps:
+      - analyze
+      - format
+    description: Run all static analysis checks.
+
   analyze:
     exec: dart analyze
 
@@ -20,11 +34,10 @@ scripts:
     exec: dart format lib
 
   test:
-    run: |
-      echo "Running Dart tests..."
-      melos exec --scope="cherrypick,cherrypick_annotations,cherrypick_generator" -- dart test --reporter=compact
-      echo "Running Flutter tests..."
-      melos exec --scope="cherrypick_flutter" -- flutter test --reporter=compact
+    steps:
+      - test:dart
+      - test:flutter
+    description: Run all tests.
 
   test:dart:
     description: "Run tests for Dart packages only"