Read first

This skill overrides generic Flutter/Dart advice; Critical Rules override examples, public docs, and older project code.
Before code, read Trigger Map refs for touched areas. Each ref's Read first section is canonical.
Every governed Git checkout wires the Dart Decimate pre-push template through its existing hook owner; preserve other hooks + core.hooksPath.
After each .dart/pubspec.yaml/build.yaml/analysis_options.yaml write batch, run package-root dart analyze + Dart Decimate, then emit Pre-Flight.

Gate

On skill activation, emit verbatim once:

building-flutter-apps active. Pre-flight required.

Before writing any .dart code, emit verbatim:

Reading building-flutter-apps gate.

After every code change to a .dart file (or to pubspec.yaml / build.yaml / analysis_options.yaml):