_permitted feeds both _join_pending and _adopt, and _adopt treats anything
missing from its result as a removal: it drops the group, purges its tally
with store.forget_group and logs "no longer a member". So one listing whose
membership no longer vouches -- the same group has been seen spelling a
member as +E.164 in one row and as a bare uuid in another, and a row can
come back with no members field at all -- would silently un-watch a live
group and delete its counts, all three claims false.
That is exactly the narrowing discovery.py's own docstring forbids ("a
failed refresh never narrows the set"), reintroduced by the gate one commit
earlier. Adoption is itself the vouch, so an already-watched id short-
circuits the check; only groups the bot has never adopted are tested.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01KbjfWdAyHbCubac7wJKJZW
Krzysztof kuhy Rudnicki
a9f6875abe