All committers have signed the CLA.

Hi maintainers, force-pushed an updated PR (017ef0d) with 3 additional bug fixes found during a deeper review of the changed files, plus a CLA-friendly commit history:

New bug fixes pushed in this round

1. TimeTunnelCommand — ConcurrentModificationException risk
   processSearch() iterated timeFragmentMap.entrySet() directly without holding the Collections.synchronizedMap monitor. Per the JavaDoc:

   "It is imperative that the user manually synchronize on the returned map when iterating over any of its collection views"

   Fixed by wrapping the iteration in synchronized (timeFragmentMap) { ... }.

2. ThreadContentionCommand — leaks JVM-wide monitoring state
   The original finally block claimed to "ensure we don't leave contention monitoring in a changed state" but only nulled the local array. If the JVM had threadContentionMonitoringEnabled disabled (the JVM default, for performance), the command would silently flip it on permanently for the whole JVM. Now captures originalContentionEnabled and only re-disables it in finally if we're the ones who turned it on.

3. ThreadContentionCommand — null-deref on dead-thread snapshot entries
   ThreadMXBean.dumpAllThreads(...) can return arrays containing null entries for threads that died between the snapshot call and the data fill. Two paths dereferenced these without null check:

   • Arrays.stream(threadInfos).filter(t -> t.getThreadState() == BLOCKED) → added .filter(Objects::nonNull) first
   • for (ThreadInfo info : threadInfos) in appendContentionAnalysis → added explicit if (info == null) continue; guard

CLA fix

Squashed all 3 prior commits into a single signed commit authored under srpatcha@users.noreply.github.com (the GitHub-verified noreply address) — same pattern that resolved the Google CLA on googletest/guava/zx. CLA assistant should now pass.

@CLAassistant recheck