mohdel v3.5.0

Added

• chatgpt/ provider for eligible ChatGPT plan access through OAuth and the
  public streaming Responses API. Account model discovery, nonstored requests,
  and token usage work through the shared library/gate adapter; API cost is zero.
• mo chatgpt login|list|select|logout|models|usage and mohdel/chatgpt helpers.
  PKCE sign-in validates identity, keeps account registrations separate, stores
  credentials under the user-data directory, and serializes rotating refreshes.
  Gate callers supply a fresh access token using the existing auth field.
• jose ^6.2.12 dependency, for ChatGPT ID-token verification.

Changed

• mo model curate chatgpt runs when no provider has an API key configured.
• openai ^7.23.0 → ^7.25.0