Joseph Doherty b8f2f66d45 feat: port session 04 — Logging, Signals & Services ...

- NatsLogger.cs: INatsLogger interface (Noticef/Warnf/Fatalf/Errorf/Debugf/Tracef),
  ServerLogging state class with atomic debug/trace flags, rate-limited logging
  (RateLimitWarnf/RateLimitDebugf), error variants (Errors/Errorc/Errorsc),
  MicrosoftLoggerAdapter bridging to ILogger
- SignalHandler.cs: ProcessSignal (Unix kill via Process), CommandToUnixSignal mapping
  (Stop→SIGKILL, Quit→SIGINT, Reopen→SIGUSR1, Reload→SIGHUP), ResolvePids via pgrep,
  SetProcessName, Run/IsWindowsService stubs for non-Windows
- 11 tests (6 logger, 5 signal/service)
- WASM/Windows signal stubs already n/a
- All 141 tests pass (140 unit + 1 integration)
- DB: features 368/3673 complete, tests 155/3257 complete (9.6% overall)

2026-02-26 11:54:25 -05:00

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