test_blocks_until_inflight_completes used patch("a2a_client.httpx.Client")
to mock the HTTP call, but httpx.Client is created inside the background
worker thread AFTER the patch context manager exits — the executor thread
was created before the patch, so it uses the original httpx module.
The httpx patch approach fails reliably when running with
test_envelope_enrichment_fetches_on_cache_miss (different httpx patch,
different peer ID, same executor thread pool). Fix: directly replace
enrich_peer_metadata on the module so the replacement is visible to the
background worker regardless of thread creation timing.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
