Onboarding: emoji-first flow with shape/color selection, user preferences, language setup (9 locales), and bot creation with avatarValue persistence. executor.ts: split 4928→4159 lines into 8 modules (completion, computer, effects, model, utils, tools, attachments, types). pi-runtime.ts: split 1726→561 lines into 2 modules (model-config, tool-utils). E2E: new onboarding-emoji-first tests + updated completeOnboarding helper.