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c6a181674b
The #10183/#10268 fix admitted a busy heavyweight request immediately whenever the heap was healthy, via an unconditional no-op lease with no bound of its own -- an unlimited number of "healthy heap" requests could pile in ahead of the heap-pressure shed path, defeating the point of admission control. Adds an independent, bounded healthy-heap headroom budget (CHAT_ADMISSION_HEALTHY_HEADROOM, tryAcquireHealthyHeadroom()) that the healthy-heap fast path draws from; once exhausted, requests fall through to the same bounded-wait/shed path used under real heap pressure, which is otherwise unchanged. Also fixes a pre-existing gap in per-connection-admission-9654.test.ts's shared-budget test, which needed an explicit heapPressureCheck override to keep exercising the #10110 invariant now that a healthy heap gets bounded headroom instead of an outright reject.