Adds a regression guard for the #11277 → proxy-bypass regression fixed in
42b394c3. With HTTPS_PROXY / HTTP_PROXY / ALL_PROXY set, the custom httpx
transport used for TCP keepalives must still route requests through an
HTTPProxy pool; without proxy env, no HTTPProxy mount should exist.
Also maps zrc <zhurongcheng@rcrai.com> → heykb in scripts/release.py
AUTHOR_MAP so the salvage PR passes the author-attribution CI check.
