perf(game): streamline room state and delivery - #12
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The backend now keeps physics state in each room, uses reliable internal messaging and independent bounded socket writers, and sends full grids only on admission or mutation. This fixes stale entity-state replies, admission and cleanup races, and slow-client broadcast stalls while preserving the client JSON protocol.
At 200 local simulated clients, outgoing traffic and combined-process allocation volume fell approximately 89%, with approximately 40 position updates per second maintained. Sampled CPU time fell 69%. The performance report documents methodology and limits.
Validation:
go test -race ./... -count=1 -timeout 120spassed. Independent review passed with only minor legacy-comment cleanup deferred.