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chat GROUP prints the last ten messages, oldest first (-N, as head -N, or
-n N for another count, paging back past the node's 200), and -m posts one
(- reads it from stdin). The application's construction: every epoch key
from chat_keys_req, a post sealed under the current epoch through the
device subkey and signed with this machine's key on the node, the sender's
name inside the envelope; nothing sent past the node's ciphertext bound.
A stored message is read signature first, then key, then content, and one
that fails is shown as unreadable, never dropped. Not done here: the Tier 2
roster check on the signing device.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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