- The opening-request replay now carries each frame's captured sender
context, so the streams the SSE transport hands the loop keep their
contextvars propagation; pinned by a test on the dual-era loop.
- Bound how many frames may precede the client's first request; past
the limit the loop stops looking for an opening request and serves a
handshake connection, so a peer streaming pre-request frames cannot
grow the buffer without bound.
- Drop the stale docs admonition that stdio still rejects listen, and
trim the era-decision docstring to the rule it now implements.
Max Isbey
c3b0e01ff2
