Centralize manager cancellation at asynchronous waits

Defer presentation through the existing non-yielding idle registration.
Check the account epoch after HTTP, worker and timer waits, and terminate
obsolete manager coroutines through LLCoros::Stopped.

Use one scope exit to retire a resident pass, removing repeated lookups,
cancellation branches and cleanup. Run the captured legacy and service
deletion sweeps in one worker job while still awaiting main-loop view
invalidation first.

Checked cancellation, retry, priority and publication outcomes with the
scheduler regressions and the Release viewer build.

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