Make an absent chiamata bidder pass instead of bidding randomly

The auction timeout bid a random legal rank, which could hand the
auction (and the call) to a disconnected player. An absent bidder now
always passes; only the last player standing before any bid cannot
pass, and is made to bid the ace - its suit is picked at random by the
existing call timeout. This keeps a deal from stalling without a caller
while never letting an absent player outbid someone.

The deadline log line now says which of the two happened.

server/packages/tavolo-briscola/README.md

@@ -41,9 +41,11 @@ Three variants share one rules core:
 Timeouts are constructor arguments (`turn_timeout_seconds`,
 `hand_ack_timeout_seconds`), wired from the environment by the
 application composition root. Briscola chiamata uses the turn timeout
-for its auction bids, the called-card choice and the plays; it never
-enters the between-deals acknowledgement phase (a single deal ends the
-match), so the hand-ack timeout is accepted but unused.
+for its auction turns, the called-card choice and the plays: an absent
+bidder passes, the last player standing with no bid is made to bid the
+ace, and an absent winner's call names a random suit of the won rank. It
+never enters the between-deals acknowledgement phase (a single deal ends
+the match), so the hand-ack timeout is accepted but unused.
 
 ## Rules