feat: port session 07 — Protocol Parser, Auth extras (TPM/certidp/certstore), Internal utilities & data structures

Session 07 scope (5 features, 17 tests, ~1165 Go LOC):
- Protocol/ParserTypes.cs: ParserState enum (79 states), PublishArgument, ParseContext
- Protocol/IProtocolHandler.cs: handler interface decoupling parser from client
- Protocol/ProtocolParser.cs: Parse(), ProtoSnippet(), OverMaxControlLineLimit(),
  ProcessPub/HeaderPub/RoutedMsgArgs/RoutedHeaderMsgArgs, ClonePubArg(), GetHeader()
- tests/Protocol/ProtocolParserTests.cs: 17 tests via TestProtocolHandler stub

Auth extras from session 06 (committed separately):
- Auth/TpmKeyProvider.cs, Auth/CertificateIdentityProvider/, Auth/CertificateStore/

Internal utilities & data structures (session 06 overflow):
- Internal/AccessTimeService.cs, ElasticPointer.cs, SystemMemory.cs, ProcessStatsProvider.cs
- Internal/DataStructures/GenericSublist.cs, HashWheel.cs
- Internal/DataStructures/SubjectTree.cs, SubjectTreeNode.cs, SubjectTreeParts.cs

All 461 tests pass (460 unit + 1 integration). DB updated for features 2588-2592 and tests 2598-2614.

docs/plans/phases/phase6sessions/session-04.md

@@ -0,0 +1,48 @@
+# Session 04: Logging, Signals & Services
+
+## Summary
+
+Logging infrastructure, OS signal handling (Unix/Windows/WASM), and Windows service management. Small session — good opportunity to also address platform-specific abstractions.
+
+## Scope
+
+| Go File | Features | Feature IDs | Go LOC |
+|---------|----------|-------------|--------|
+| server/log.go | 18 | 2050–2067 | 207 |
+| server/signal.go | 5 | 3155–3159 | 156 |
+| server/signal_wasm.go | 2 | 3160–3161 | 6 |
+| server/signal_windows.go | 2 | 3162–3163 | 79 |
+| server/service.go | 2 | 3148–3149 | 7 |
+| server/service_windows.go | 5 | 3150–3154 | 79 |
+| **Total** | **34** | | **534** |
+
+## .NET Classes
+
+- `NatsLogger` (or logging integration) — server logging wrapper
+- `SignalHandler` — OS signal handling (SIGTERM, SIGHUP, etc.)
+- `ServiceManager` — Windows service lifecycle
+
+## Test Files
+
+| Test File | Tests | Test IDs |
+|-----------|-------|----------|
+| server/log_test.go | 6 | 2017–2022 |
+| server/signal_test.go | 19 | 2910–2928 |
+| server/service_test.go | 1 | 2908 |
+| server/service_windows_test.go | 1 | 2909 |
+| **Total** | **27** | |
+
+## Dependencies
+
+- Session 01 (Foundation Types)
+
+## .NET Target Location
+
+- `dotnet/src/ZB.MOM.NatsNet.Server/Internal/` (logging)
+- `dotnet/src/ZB.MOM.NatsNet.Server.Host/` (signal/service)
+
+## Notes
+
+- .NET uses `Microsoft.Extensions.Logging` + Serilog per standards
+- Windows service support maps to `Microsoft.Extensions.Hosting.WindowsServices`
+- Signal handling maps to `Console.CancelKeyPress` + `AppDomain.ProcessExit`