- Remove RunnableVariant::Compat variant entirely
- Update PlatformScheduler::timer() to use async_task::Builder with RunnableMeta
- Update REPL's ZedDispatcher to wrap external Runnable with metadata
- Simplify all platform dispatchers (Mac, Linux, Windows, Test):
- Remove Compat match arms
- Use let-binding pattern for single-variant enum
- Remove unused trampoline_compat function from Mac dispatcher
All tasks now carry source location information for better debugging
and profiling. The RunnableVariant enum is now single-variant and
could be simplified further in a future change.
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