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):

Run dart analyze from the package root. Block on any ERROR or WARNING.
Emit the filled-in Pre-Flight checklist. T0 always. T1 / T2 only if their domain was touched.
If dart analyze is not wired with flutter_skill_lints, run Setup before continuing.

Critical Rules

Use dart analyze from package root, never flutter analyze and never path-scoped. Copy references/analysis_options.yaml to project root and wire flutter_skill_lints + riverpod_lint under plugins:. flutter analyze lib silently drops plugin diagnostics (flutter#184190).