The map used to grow unbounded over the process's lifetime — every fresh
signup added an entry that was never reclaimed. Long-running dev hosts
(or any future emulator deployment that doesn't restart often) would
gradually leak memory. Cap at 10k entries by default with a simple FIFO
eviction queue; re-stores of the same SID don't grow the queue.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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