The keeper can bring back a seat a browser lost: a new token on the ledger, the old one refused, and a link that carries it in the fragment, minted by hnefatafl-reseat.sh through a /keeper door Caddy does not proxy and that turns away anything Caddy forwarded; the join page takes a linked seat only once the server accepts it and never over a seat this browser holds that still opens, a spectator at a game in play is told both ways back, the hall asks before forgetting a game in play, and the server's tests now run with the rest

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01MbtUPJ24P6vc6tE1x6RS3m

docs/conventions.md

@@ -37,6 +37,15 @@ README.
 - **A seat travels by phrase**: *Transfer seat* in the masthead mints four
   words good for ten minutes and one use; the hall's *bring a seat from
   another device* claims them. The browser that claims holds the seat too.
+- **The keeper can bring a seat back**: a player whose browser lost the
+  seat (Safari's seven days, an app's own browser, cleared data) writes to
+  the keeper, and `<slug>-reseat.sh ROOM SEAT` on the host gives the seat
+  a new token and prints a link carrying it in the fragment. The old token
+  opens nothing after. A link is kept only once the server takes it, and
+  never over a seat the browser holds that still opens. The script answers
+  through the game server's `/keeper` door, which Caddy does not proxy. A
+  spectator at a game in play is told both ways back, and the hall asks
+  before forgetting a game in play.
 - **Held seats are doubted before they are dropped**: the hall forgets a
   seat only on the second refusal in a row from the server. A restart, a
   stale answer or the wrong backend answer with ignorance, and ignorance
@@ -123,6 +132,8 @@ Every game gets the same tools, installed by `deploy.sh` on every deploy:
 - `<slug>-visitors.sh` (skill `<slug>-visitors`): who is here now, who came
   today, every room opened and how far it got. Names seated for the first
   time are marked NEW.
+- `<slug>-reseat.sh ROOM [SEAT]`: who sits at a table and when each last
+  acted; with a seat, a new token for a player locked out, as a link.
 - `<slug>-pulse.sh` (skill `<slug>-pulse`): service health, journal errors,
   the rollup's last week, the backup's last word, the box's vitals.
 - `<slug>-rollup.sh` nightly at 00:12 UTC: one JSON line a day of counts,