M3 R3.1 capture: scaffold net481 x64 harness + load-check (PASS)

First increment of the native-2023R2-gRPC capture (docs/plans/revision-write-path.md
§"R3.1 capture plan"). Loads the mixed-mode aahClientManaged.dll by path (sibling resolver
over bin/ + msi-extract/.../Bin/x64) and reflects the connection API — no live contact.

load-check result on this box (net481 x64):
- aahClientManaged.dll loads cleanly (no missing VC++ runtime / no BadImageFormat) — confirms
  the self-contained mixed-mode assembly runs without an AVEVA install.
- HistorianConnectionMode.Historian = 2 (the 2023 R2 gRPC mode; ClassicHistorian = 1 = legacy)
  — the value the live-connect step sets on HistorianConnectionArgs.ConnectionMode.
- GrpcHistoryClient resolves with RegisterTags + AddNonStreamValues present — the IL-rewrite
  capture targets are reachable.

Standalone net481 project (not in Histsdk.slnx, like NativeTraceHarness). Next: read-only
gRPC connect + tag read (first live step, per-action auth), then IL-rewrite + write capture.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01B6mcaT2PjRFKcogzp9UkfC

tools/AVEVA.Historian.Grpc2023CaptureHarness/AVEVA.Historian.Grpc2023CaptureHarness.csproj

@@ -0,0 +1,22 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <!--
+    Drives the 2023 R2 native (mixed-mode) aahClientManaged.dll over gRPC to capture the two
+    remaining M3 non-streamed-write buffers (regular-tag HistoryService.RegisterTags btTagInfos +
+    TransactionService.AddNonStreamValues btInput) — see docs/plans/revision-write-path.md
+    §"R3.1 capture plan". net481 + x64 because the 2023 R2 aahClientManaged.dll is x64 mixed-mode.
+    The 2023 R2 binaries live OUTSIDE the repo (histsdk-2023r2-analysis) and are loaded by path via
+    Assembly.LoadFrom + a sibling resolver, exactly like AVEVA.Historian.NativeTraceHarness loads
+    current/aahClientManaged.dll. Nothing from the analysis tree is referenced/compiled-against.
+  -->
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net481</TargetFramework>
+    <LangVersion>latest</LangVersion>
+    <ImplicitUsings>disable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+    <PlatformTarget>x64</PlatformTarget>
+    <AssemblyName>Grpc2023CaptureHarness</AssemblyName>
+  </PropertyGroup>
+
+</Project>