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Add collections module: HashMap bucket layout, treeification, and a real ConcurrentModificationException reproduction

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Companion code for the ankurm.com post "Top 40 Java Collections Interview Questions
(HashMap Internals to Fail-Fast Iterators)". Verified against JDK 25's own HashMap
source (TREEIFY_THRESHOLD=8, UNTREEIFY_THRESHOLD=6, MIN_TREEIFY_CAPACITY=64), with
every claim backed by a committed docs/output/*.txt transcript from a real run.

Co-Authored-By: Claude Sonnet 5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01YXCrLgRKFgCh9RHKW8xaqJ
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asmhatre
2026-10-01 04:27:27 +00:00
co-authored by Claude Sonnet 5
commit d4b3a63615
27 changed files with 1085 additions and 0 deletions
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collections/docs/output/07-cme-concurrenthashmap-no-throw.txt
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ConcurrentHashMap's iterator is weakly consistent: it never throws CME
======================================================================
map before: {0=v0, 1=v1, 2=v2, 3=v3, 4=v4}
entries visited during iteration (original 5, plus possibly some newly-added ones): 19
map after: 24 entries total
ConcurrentModificationException thrown: false
(weakly consistent: may or may not reflect the mutation, but is guaranteed never to throw)