Ankur Mhatre 9b3fe88813 Add the async module ...

Every @Async behaviour that surprises people, asserted by a test and captured
to docs/output/: the self-invocation trap, what CGLIB cannot override, the
IllegalArgumentException a plain return type throws, the unbounded queue that
makes max-size decoration, spring.task.execution.propagate-context (new in
Boot 4.1.0), the two Executor beans that leave @Async on an unpooled
SimpleAsyncTaskExecutor, and JEP 491 measured on JDK 21 against JDK 25.

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..

context-propagation.txt

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executor-force-mode.txt

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executor-one-custom.txt

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executor-report.txt

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executor-two-custom.txt

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pinning-probe.txt

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pool-bounded-queue.txt

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pool-unbounded-queue.txt

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return-types.txt

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self-invocation.txt

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tests.txt

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virtual-threads.txt

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visibility.txt

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