A game may take drafts: an input it does not call settled can be replaced, and the round waits for settled ones

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

CONVENTIONS.md

@@ -123,6 +123,20 @@ README.
   round resolves; keep the old path behind `state.rules < N` and pin both
   with tests. A fix that diverges from no ledger ships without a bump.
 
+## Optional hooks
+
+A game implements only the hooks it needs; without one, the kit behaves as
+if it were never there.
+
+- `validate(state, seat, input)`: a reason to refuse a move, shown to the player.
+- `seatsFor(options)`: fewer seats for some table options.
+- `settled(input)`: whether an input is final. A game with drafts answers
+  false until the player says it is done; a draft may be replaced, and the
+  round waits for every seat's settled input.
+- `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).
+
 ## The server
 
 One Node process per game, on its own port, run from source with `tsx` as