Add setup launcher scripts for auto-start

- Add setup.command (Mac/Linux) and setup.bat (Windows) that run
  `claude -p "start"` to auto-trigger setup without user input
- Update GETTING-STARTED.md with launcher instructions
- Fix style references in README and docs to reflect Warm 4o-Style
  as the new default core persona

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

setup.command

@@ -0,0 +1,3 @@
+#!/bin/bash
+cd "$(dirname "$0")"
+claude -p "start"