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)

reports/current.md

@@ -1,6 +1,6 @@
 # NATS .NET Porting Status Report
 
-Generated: 2026-02-26 14:15:20 UTC
+Generated: 2026-02-26 14:39:36 UTC
 
 ## Modules (12 total)
 
@@ -13,17 +13,17 @@ Generated: 2026-02-26 14:15:20 UTC
 
 | Status | Count |
 |--------|-------|
-| complete | 265 |
-| n_a | 74 |
-| not_started | 3334 |
+| complete | 328 |
+| n_a | 79 |
+| not_started | 3266 |
 
 ## Unit Tests (3257 total)
 
 | Status | Count |
 |--------|-------|
-| complete | 119 |
-| n_a | 12 |
-| not_started | 3126 |
+| complete | 139 |
+| n_a | 49 |
+| not_started | 3069 |
 
 ## Library Mappings (36 total)
 
@@ -34,4 +34,4 @@ Generated: 2026-02-26 14:15:20 UTC
 
 ## Overall Progress
 
-**481/6942 items complete (6.9%)**
+**606/6942 items complete (8.7%)**