The published spec says a group pin "is carried correctly on the wire but
cannot resolve yet, because a group transcript does not record" a message
id. `Session.sendGroup` mints a mid and passes it to `record(...)`, so the
stated reason is already false — but relay#46's rule is that a claim is
flipped by a run, not by reading the code, and nothing exercised the group
case specifically.
Five tests, on a group thread rather than a 1:1 one, because that is what
the spec singles out: the transcript carries an id, the pin resolves to the
message it names, and a group pin does not leak into a DM.
⚠️ One of them is about the design rather than the plumbing. The pin stores
an ID and never a copy, so the banner follows an edit instead of quoting
words that are no longer in the conversation — a stored copy would go stale
the moment the message changed and would outlive it being deleted.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
