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-13.md

@@ -0,0 +1,39 @@
+# Session 13: Configuration Reload
+
+## Summary
+
+Hot-reload system for server configuration. Detects config changes and applies them without restarting the server. Each option type has a reload handler.
+
+## Scope
+
+| Go File | Features | Feature IDs | Go LOC |
+|---------|----------|-------------|--------|
+| server/reload.go | 89 | 2800–2888 | 2,085 |
+| **Total** | **89** | | **2,085** |
+
+## .NET Classes
+
+- `ConfigReloader` — reload orchestrator
+- 50+ individual option reload types (e.g., `AuthOption`, `TlsOption`, `ClusterOption`, `JetStreamOption`, etc.)
+
+## Test Files
+
+| Test File | Tests | Test IDs |
+|-----------|-------|----------|
+| server/reload_test.go | 73 | 2721–2793 |
+| **Total** | **73** | |
+
+## Dependencies
+
+- Session 03 (Configuration — ServerOptions)
+- Session 09 (Server Core Part 1)
+
+## .NET Target Location
+
+- `dotnet/src/ZB.MOM.NatsNet.Server/ConfigReloader.cs`
+
+## Notes
+
+- Many small reload option types — consider using a single file with nested classes or a separate `Reload/` folder
+- Each option type implements a common interface for diff/apply pattern
+- 73 tests cover each option type's reload behavior