Initial commit: managed .NET 10 AVEVA Historian SDK + reverse-engineering toolkit

Full read-only SDK (src/AVEVA.Historian.Client) implementing the CLAUDE.md required
surface against AVEVA Historian's binary WCF protocol — no native AVEVA runtime
dependency. All operations live-verified against a local Historian:

- ProbeAsync, ReadRawAsync, ReadAggregateAsync, ReadAtTimeAsync, ReadEventsAsync
- BrowseTagNamesAsync, GetTagMetadataAsync (17 native data-type codes mapped)
- GetConnectionStatusAsync, GetStoreForwardStatusAsync, GetSystemParameterAsync
- 108/108 unit + integration tests pass

Includes the reverse-engineering toolkit (tools/AVEVA.Historian.ReverseEngineering)
used to decode the protocol: WCF probes, IL inspection via dnlib, and IL-rewrite
instrumentation (instrument-wcf-{write,read}message etc.) plus the .NET Framework
trace harness (tools/AVEVA.Historian.NativeTraceHarness) for parity testing.

Sanitized handoff evidence under docs/reverse-engineering/. Native AVEVA binaries
(current/, aveva-install-x64/, aveva-install-x86/) are gitignored — fetch separately
from the AVEVA installer.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/AVEVA.Historian.Client/HistorianClientOptions.cs

@@ -0,0 +1,30 @@
+using AVEVA.Historian.Client.Models;
+
+namespace AVEVA.Historian.Client;
+
+public sealed class HistorianClientOptions
+{
+    public const int DefaultPort = 32568;
+
+    public required string Host { get; init; }
+
+    public int Port { get; init; } = DefaultPort;
+
+    public TimeSpan ConnectTimeout { get; init; } = TimeSpan.FromSeconds(5);
+
+    public TimeSpan RequestTimeout { get; init; } = TimeSpan.FromSeconds(30);
+
+    public string UserName { get; init; } = string.Empty;
+
+    public string Password { get; init; } = string.Empty;
+
+    public bool IntegratedSecurity { get; init; }
+
+    public bool Compression { get; init; }
+
+    public HistorianConnectionKind ConnectionKind { get; init; } = HistorianConnectionKind.Process;
+
+    public HistorianTransport Transport { get; init; } = HistorianTransport.LocalPipe;
+
+    public string TargetSpn { get; init; } = @"NT SERVICE\aahClientAccessPoint";
+}