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Add virtual-thread, structured-concurrency demos for the Spring Security context propagation guide

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Three verified programs (JDK 25, Spring Security 7.1.1, Spring Boot 4.1.1 dependency
versions) backing the ankurm.com post: InheritableThreadLocal across thread models,
@Async on a virtual-thread SimpleAsyncTaskExecutor (DelegatingSecurityContextExecutor
vs ContextPropagatingTaskDecorator), and StructuredTaskScope.fork() propagation.
Captured console output and docs chapters included.
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Ankur
2026-08-24 21:48:47 +05:30
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=== Demo 1: InheritableThreadLocal across thread models ===
fresh platform thread sees: request-A
pool thread, task 1, sees: request-B
pool thread, task 2 (reused), sees: request-B <-- stale, not request-C
fresh virtual thread sees: request-D