Webhook transport already retries HTTP 421, 423 and 425, but shared classification marked them terminal and discarded the remaining queue retry budget. Align these exceptions with retryable connectivity or receiver failure classes. A synthetic 400-599 transport matrix reproduces the three mismatches and verifies permanent rejections remain terminal without starting storage workers.
Change-source: pulse-maintainer
pulse-triage[bot]
c65ba29bf7