ENG15 figure review

Blocking occupies request threads, async suspends operations and the semaphore limits admission to two holders.
ENG15-v1
Eight handler stacks contain the synchronous gate while other runtime waits are explicitly excluded from that count.
ENG15-v2
Two permits are held while six operations wait asynchronously for admission.
ENG15-v3
The median handler durations for each of three processes are shown separately for all variants.
ENG15-v4
Ready ThreadPool work, suspended operations and resource waiters are separate diagnostic categories.
ENG15-v5

Motion

Conceptual state transition