Self-test a mobile feature change or bug fix after implementation in `apps/mobile`. Use this whenever the user asks to verify a mobile change, run simulator acceptance, smoke-test a mobile PR, or provide screenshot proof for a mobile fix. This skill decides between prod vs local API mode, starts the local follow-server when needed, builds a release app, uses Maestro only to bootstrap registration for non-auth work, then switches to screenshot-driven visual validation and returns screenshot evidence.