feat(grpc-events): handle-capture cycle — event-row gap proven NOT a client payload issue

Extends the instrument-grpc rewrite to log string (strHandle) + uint (uiHandle /
queryRequestType) params, not just byte[], and captures our SDK's live v8
openParameters for a byte-diff against the native.

Result of the exhaustive comparison (all live-confirmed via the opt-in
EventReadDiagnostic test):
- StartEventQuery request: byte-identical to the native (v6 layout)
- v8 OpenConnection openParameters: byte-identical to the native (302B) once
  ClientNodeName matches — every control byte/ConnectionType/token/ShardId
- handle usage identical: ExchangeKey->contextKey, registration->storage GUID
  (strHandle), query->client uint (uiHandle); handles valid (RTag/EnsT=True)
- queryRequestType=3, registration order, gzip metadata header — all match
- window has events (native returns 50 now); eventCount not it

Every observable client-side byte matches the native, yet the server scopes 0
events to our connection. The event RPCs succeed over our transport and return a
valid EMPTY result (not a transport error), so this is a connection/server-level
difference (session affinity tied to the native Grpc.Core HTTP/2 connection or a
connection identity used to scope events) — invisible to and unfixable by client
payload matching. Needs server-side insight, not more wire RE.

Added opt-in diagnostics (RegistrationDiag, LastResultBufferHex,
LastEventOpenRequestHex). 326/326 offline; gated test still pins the no-row throw.

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

tests/AVEVA.Historian.Client.Tests/HistorianGrpcIntegrationTests.cs

@@ -547,7 +547,8 @@ public sealed class HistorianGrpcIntegrationTests
 
         throw new Xunit.Sdk.XunitException(
             $"[DIAG] outcome={outcome} | events={events.Count} | LastResultLen={orch.LastResultBufferLength} " +
-            $"| ResultHex={orch.LastResultBufferHex} | ErrHex={orch.LastErrorBufferHex} | Reg=[{orch.RegistrationDiag}]");
+            $"| ResultHex={orch.LastResultBufferHex} | Reg=[{orch.RegistrationDiag}] " +
+            $"| v8open={AVEVA.Historian.Client.Grpc.HistorianGrpcHandshake.LastEventOpenRequestHex}");
     }
 
     [Fact]
@@ -677,7 +678,8 @@ public sealed class HistorianGrpcIntegrationTests
             IntegratedSecurity = !explicitCreds,
             UserName = user ?? string.Empty,
             Password = password ?? string.Empty,
-            RequestTimeout = timeout
+            RequestTimeout = timeout,
+            Compression = true // the stock client always advertises grpc gzip request encoding
         };
     }
 }