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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 2: @Async-style virtual thread executor + SecurityContext ===
A) MODE_THREADLOCAL, raw SimpleAsyncTaskExecutor(virtual): NO AUTHENTICATION (lost) [VirtualThread[#23,vt-1]/runnable@ForkJoinPool-1-worker-1]
B) MODE_INHERITABLETHREADLOCAL, raw SimpleAsyncTaskExecutor(virtual): authenticated as bob [VirtualThread[#26,vt-1]/runnable@ForkJoinPool-1-worker-1]
C) DelegatingSecurityContextExecutor around SimpleAsyncTaskExecutor(virtual): authenticated as carol [VirtualThread[#27,vt-1]/runnable@ForkJoinPool-1-worker-1]
SecurityContextHolderThreadLocalAccessor present: true
D) ContextPropagatingTaskDecorator on SimpleAsyncTaskExecutor(virtual), no Delegating* wrapper: authenticated as dave [VirtualThread[#28,vt-1]/runnable@ForkJoinPool-1-worker-1]