All Photon sidecar HTTP requests target 127.0.0.1 — they should
never be routed through a system HTTP proxy. When trust_env=True
(the default), httpx picks up macOS system proxy settings and
routes localhost requests through the proxy. If the proxy returns
a spurious response (e.g. 502), _reap_stale_sidecar() interprets
it as 'port in use by a non-sidecar process' and refuses to start,
yielding: 'pids: unknown, not a Photon sidecar'.
Set trust_env=False on all five httpx.AsyncClient call sites in
the Photon adapter so localhost sidecar communication bypasses
the system proxy entirely.
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