• replace per-PR CHANGES.rst / __init__.py ceremony with an AI-drafted
  release flow: contributors no longer touch version or changelog files; a
  workflow-triggered agent synthesizes merged PRs into a release PR at release
  time (closes #1167) (#1592)
• add AioSession.warm_up_loader_caches() and warm_up_loader_caches
  option in AioConfig to pre-populate botocore loader caches off the event
  loop, avoiding blocking file I/O on first client/waiter/paginator use
  (closes #1199) (#1462)
• fix race condition in AioAssumeRoleProvider._visited_profiles causing
  false InfiniteLoopConfigError under concurrent async usage
  (closes #1455) (#1537)
• fall back to synchronous subprocess.run (via asyncio.to_thread) for
  credential_process when the running event loop does not implement
  subprocess transports — notably asyncio.SelectorEventLoop on Windows
  (closes #1415) (#1588)