Rematches, seats that travel by phrase, the keeper's bell with the hour where they live, the host's leave for the gallery to talk, and seats doubted before they are dropped

Ported from Wiz-War, where each earned its keep. All on the ledger:
galleryTalk, challenge and rematch lines, gallery chat signed with a
name, held seats on a rematch table's room line. Twenty-two protocol
checks against a scratch server and a replay after restart.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Jm2auWk6RP71CjaAb4FMoG

template/deploy/__SLUG__.service

@@ -7,6 +7,8 @@ Type=simple
 User=__SLUG__
 WorkingDirectory=/opt/__SLUG__/app/server
 Environment=PORT=__PORT__
+Environment=KEEPER=Kestrel
+Environment=KEEPER_TZ=America/New_York
 # Caddy terminates TLS; the plaintext port must not face the internet.
 Environment=HOST=127.0.0.1
 Environment=DATA_DIR=/var/lib/__SLUG__/rooms