Adds the concurrency-interview module: a real race condition with its
actual lost-update count, why volatile alone doesn't fix it, a real
JVM-detected deadlock (ThreadMXBean.findDeadlockedThreads()) with the
fix, and ScopedValue's exact child-thread inheritance rules (finalized
in JDK 25 via JEP 506, demonstrated against StructuredTaskScope, still
preview per JEP 505/525). 4 runnable demos, 1 JUnit test class (9
tests), 5 captured output transcripts.
Co-Authored-By: Claude Sonnet 5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01FhzLY5p6okFva3qsnsRyvM
asmhatreandClaude Sonnet 5
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