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.

reports/current.md

@@ -1,6 +1,6 @@
 # NATS .NET Porting Status Report
 
-Generated: 2026-02-26 17:27:34 UTC
+Generated: 2026-02-26 18:16:57 UTC
 
 ## Modules (12 total)
 
@@ -13,18 +13,18 @@ Generated: 2026-02-26 17:27:34 UTC
 
 | Status | Count |
 |--------|-------|
-| complete | 467 |
+| complete | 472 |
 | n_a | 82 |
-| not_started | 3031 |
+| not_started | 3026 |
 | stub | 93 |
 
 ## Unit Tests (3257 total)
 
 | Status | Count |
 |--------|-------|
-| complete | 225 |
+| complete | 242 |
 | n_a | 82 |
-| not_started | 2726 |
+| not_started | 2709 |
 | stub | 224 |
 
 ## Library Mappings (36 total)
@@ -36,4 +36,4 @@ Generated: 2026-02-26 17:27:34 UTC
 
 ## Overall Progress
 
-**867/6942 items complete (12.5%)**
+**889/6942 items complete (12.8%)**