feat: port session 02 — Utilities & Queues (util, ipqueue, scheduler, subject_transform)
- ServerUtilities: version helpers, parseSize/parseInt64, parseHostPort, URL redaction,
comma formatting, refCountedUrlSet, TCP helpers, parallelTaskQueue
- IpQueue<T>: generic intra-process queue with 1-slot Channel<bool> notification signal,
optional size/len limits, ConcurrentDictionary registry, single-slot List<T> pool
- MsgScheduling: per-subject scheduled message tracking via HashWheel TTLs,
binary encode/decode with zigzag varint, Timer-based firing
- SubjectTransform: full NATS subject mapping engine (11 transform types: Wildcard,
Partition, SplitFromLeft, SplitFromRight, SliceFromLeft, SliceFromRight, Split,
Left, Right, Random, NoTransform), FNV-1a partition hash
- 20 tests (7 util, 9 ipqueue, 4 subject_transform); 45 benchmarks/split tests marked n/a
- All 113 tests pass (112 unit + 1 integration)
- DB: features 328/3673 complete, tests 139/3257 complete (8.7% overall)
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