v0.3.10

Changed

• retry_attempts now means number of retries after the initial attempt:
  • 0 = try once, no retry
  • 2 = 3 total attempts (1 initial + 2 retries)
• Default changed from 3 to 2 to preserve the same 3-total-attempts behavior.
• Session establishment retry also respects this setting (previously hardcoded).