v1.49.0

• Route the Codex implementer seats to codex:astra: the tournament's Codex contestant fallback
  and the command-heavy implementer switch in /stereo:implement and /stereo:quick now name
  Astra, so a Codex-routed implementer resumes the plan-review thread it approved
• Accept ultra as a reasoning effort across the model registry, every command's effort flags,
  the CLI usage text, and the runtime skill; it is the tier above max on the models that
  advertise it, and the pair-role defaults stay max