v0.13.1

Fixed

• With prompt_keep_warm on, a read after Home Assistant refused the token was
  answered by the warm agent with prose, and was recorded as healthy, instead of
  the notice and the degraded outcome a fresh read gives. A warm session is now
  neither served nor kept while Home Assistant does not accept the connection
  (refused or unreachable): the read runs fresh and is judged like any fresh read.
  Because a warm turn makes no request that could show a change, the server asks
  Home Assistant about the token (one request) before it offers a read to a warm
  session; a token already known to be refused is not asked about again.
• A streamed answer that a notice replaces (a device that matches more than one,
  or none) used to stop mid-word where the stream's hold-back ended, and the
  notice followed. The model's text now goes out whole before the notice.
• The hook audit lines (cc-hook-audit, cc-hook-backup) were stamped in local
  time while the prompt server's lines in the same file are UTC. The shell writers
  now take the stamp from one function, audit_timestamp (UTC, the prompt
  server's format), and a test discovers every writer of the file and runs each
  under a zone far from UTC.