chore: minor ci fixes (#994)

Author: hiroshihorie

.github/workflows/changeset.yaml

@@ -64,8 +64,8 @@ jobs:
           echo "$DIFF_OUTPUT"
           echo "---"
 
-          # Extract breaking changes from the output
-          BREAKING_LINES=$(echo "$DIFF_OUTPUT" | grep -i "breaking" || true)
+          # Check for "BREAKING CHANGES" header in the output (not "No breaking changes!")
+          BREAKING_LINES=$(echo "$DIFF_OUTPUT" | grep "^BREAKING CHANGES" || true)
 
           if [ -n "$BREAKING_LINES" ]; then
             echo "has_breaking=true" >> "$GITHUB_OUTPUT"

scripts/create_version.dart

@@ -224,6 +224,7 @@ String generateChangelogEntry(SemanticVersion version, List<Change> changes) {
       };
 
   for (final kind in ChangeKind.values) {
+    if (kind == ChangeKind.chore) continue;
     for (final change in changes.where((c) => c.kind == kind)) {
       buffer.writeln('* ${prefixFor(change.kind)}: ${change.description}');
     }