ReactiveX / RxPY / 30293506554

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fix(scheduler): use wall clock time for now() in event loop schedulers (#809)

schedule_absolute() is implemented as schedule_relative(duetime - now),
so a scheduler whose now() reports its event loop's internal monotonic
clock cannot accept the ordinary datetime values users pass to operators
like take_until_with_time(). On eventlet the offset is roughly 56 years,
so the scheduled action never fires.

Drop the now() overrides from the event loop schedulers so they inherit
Scheduler.now (wall clock UTC), matching every other scheduler in the
library. schedule_relative() is unaffected: it passes seconds to the
loop's own call_later() and never consults now().

Document the contract on SchedulerBase.now and Scheduler.now, and add
schedule_absolute regression tests for all five event loop schedulers.

Fixes #724

Co-authored-by: Claude Opus 5 (1M context) <noreply@anthropic.com>

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