- gateway/run.py: use _adapter_for_source(source) instead of the raw
adapters.get(source.platform) map so the compression-timeout warning
respects transport provenance, relay ingress, and multiplexed profiles
(matches every other user-facing send in the hygiene block).
- tests: add a lock-release verification regression — a fence-cancelled
hygiene compression must leave the per-session compression lock free so
the next attempt (manual /compress retry) acquires it and commits
normally.