request_raw_snapshot_from_rudp_catalog put a catalog's error text into
its own error unfiltered. It now reports "refused the snapshot", naming
the refusal only when it is one of the fixed CultMesh refusal texts, as
the publisher does; both share recognised_refusal.
The publisher's doc claimed any refusing catalog is reported as a
refusal. That holds against a Rust catalog, which never acknowledges a
message it refuses; a catalog that acknowledges on receipt and refuses
afterwards (the TypeScript document server) is reported as having
admitted it. The doc now says so.
A fake catalog refusing with a canary is shared by the publisher test
and a new snapshot-client test.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
b8f754c898