onboarding

## Install Path Detection At the very start, before any user interaction, detect which install path was used: Check if `.claude/plugins/onebrain/` exists locally in this vault directory. **Re-run check:** If `.claude/plugins/onebrain/` exists AND `onebrain.yml` exists, this is a re-run on an already-configured vault. Tell the user: > OneBrain is already set up in this vault. Running onboarding again will update your identity and preferences : your notes and vault structure will not change. Continue? Wait for confirmation. If they confirm, proceed with Path A flow (existing steps). If they decline, stop. **Path B detected:** If `.claude/plugins/onebrain/` does NOT exist locally: - If `onebrain.yml` also exists : warn the user before continuing: `OneBrain vault config (onebrain.yml) found but plugin files are missing. Proceeding to re-adopt the plugin. Your existing onebrain.yml will be preserved. If MEMORY.md exists, you'll be asked whether to keep or replace it.` - Skip to the **Path B** section at the bottom of this skill. **Path A detected:** If `.claude/plugins/onebrain/` exists locally (and it is a first run or confirmed re-run), continue with the steps below (existing onboarding flow). --- # OneBrain Onboarding Welcome to OneBrain! This skill personalizes your vault and sets up your AI chief of staff. **Run this once when you first set up OneBrain.** --- ## Platform Note For steps that present a fixed set of choices (personality archetype, communication styl...