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Josh Creek
1becfb4f3f
First slice of task 8.19. docs/MATCHMAKING.md specifies the choice precisely -- "the oldest ordinary casual ticket that meets the same build, region <=100 ms and current anchor-tolerance rules for the vacated human slot; ties use ticket ID" -- and that rule is needed whatever is decided about delivering a late authorisation to a running server, so it is worth landing on its own. Kept a pure function over an already-fetched candidate set: the choice is then reproducible and testable without a database, and claiming the ticket stays a durable transaction as it is for ordinary proposals. Ties break on ticket ID rather than scan order, so two replicas evaluating the same queue cannot offer one slot to different players. Region matching is stricter than ordinary formation: the server already exists in one region, so a candidate must have RTT evidence for that region specifically, not merely share some region with the others. Eligibility is re-checked here as well as at the durable boundary, so an ineligible mid-play or human-occupied slot never reaches selection at all. Ranked is refused outright. Corrected a comment I had written claiming the backfill window is shorter than an ordinary proposal's; both are 10 seconds. What makes a backfill offer separate is its payload and the absent decline penalty, not its timing. This does not yet make backfill work end to end -- see the roster delivery question raised alongside this commit.