By: Ammar Nanjiani <ammar.nanjiani@gmail.com>
feat(pi): route GPT-6 Sol and Grok 4.7 Make GPT-6 Sol the Pi default coordinator and review lane. Add Grok 4.7 as the investigative worker. Allow GPT-6 Luna for later trials without making it a default scout or worker. Pin Aragorn Hermes to grok-4.7 with gpt-6-sol as the Codex fallback. Keep gpt-5.6-sol and grok-4.6 in the Pi allowlist during rollout.