A table may ask each seat to rank its choices before the deal, in secret; the start line keeps the rankings and create reads them

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Jm2auWk6RP71CjaAb4FMoG

CONVENTIONS.md

@@ -140,6 +140,11 @@ if it were never there.
   own input in waiting (`yourInput`), so a page reopened shows the draft,
   and its input in the last round it played (`yourLastInput`), so the page
   can tell it what became of its own choice.
+- `rankable(options)`: the choices a table asks each seat to rank before
+  the deal (sides, roles, colours). The lobby shows a seat its own ranking
+  and how many have ranked, nothing more; the start line records every
+  ranking and `create` receives them. A solo table asking for one waits in
+  the lobby for the player's.
 - `tally(state)`: the game's own lines for the tally, from a finished game.
 - `preferences`, `options`: the preferences panel's settings and the
   host's table choices (above).