docs: availability between members is a finding category

The first three reviews asked who can read what, who can impersonate whom,
and what a hostile node can forge. None asked what a legitimate but
misconfigured or careless member costs everyone else — which is the question
a group platform lives on, because every member was invited by someone who
trusted them and none of them is an attacker.

C2 had asked "can a node claim a group its owner is not in?" and the answer
was correctly no. Nobody had asked what happens when a node claims one its
owner *is* in but does not host, which is how a group went dark for all of
its members with its real host online throughout.

§13.5b is the register, AV1 to AV8. The lens, for anything reviewed from
here: a participant supplies input; if anyone other than the sender bears the
cost, there is a ceiling to write, and it goes on every path that writes the
state.

CLAUDE.md gets the working rule and the incident as a lesson, and the stale
path to sync-ui.js corrected — it lives under scripts/, not build/.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01T4YmK41VsEURWFdop4EEeT

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