- Use more specific grep pattern `^\[.*s\] \|` for build_runner progress
lines in codegenBase() and CheckMocks(), preserving [SEVERE]/[INFO] messages
- Filter `Downloading packages` and `+` lines from flutter pub get output
(git commit -q and flutter test summary patterns were already applied)
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>