test(run_agent): pin proxy-env forwarding through keepalive transport

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.

scripts/release.py

@@ -275,6 +275,7 @@ AUTHOR_MAP = {
     "junminliu@gmail.com": "JimLiu",
     "jarvischer@gmail.com": "maxchernin",
     "levantam.98.2324@gmail.com": "LVT382009",
+    "zhurongcheng@rcrai.com": "heykb",
 }