Strengthen live event-read test: assert well-formed parsed events

ReadEventsAsync verified to return real, parsed events against the local 2020
server (e.g. User.Write with 18 properties) — the row parser (HistorianEventRowProtocol
v9) is wired and works. The prior test only asserted NotNull with a stale "row
format not yet decoded" comment.

- Renamed to ReadEventsAsync_AgainstLocalHistorian_ReturnsWellFormedEvents.
- Widened the window to 30 days (robust against a quiet recent window).
- Asserts NotEmpty + per-event well-formedness (non-empty Type, non-null
  Properties, EventTimeUtc within the queried window) — matching the ReadRawAsync
  test's NotEmpty style.
- Documents the known limitation: enumeration stops at the first benign
  `type=4 code=85` soft-terminal, so this verifies parsing correctness rather than
  exhaustive retrieval (draining all rows needs the code-85 decode, a capture task).

Passes live (1 event over 30 days). Non-live unit suite unaffected.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

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

@@ -211,7 +211,7 @@ public sealed class HistorianClientIntegrationTests
     }
 
     [Fact]
-    public async Task ReadEventsAsync_AgainstLocalHistorian_DoesNotThrow()
+    public async Task ReadEventsAsync_AgainstLocalHistorian_ReturnsWellFormedEvents()
     {
         string? host = Environment.GetEnvironmentVariable("HISTORIAN_HOST");
         if (string.IsNullOrWhiteSpace(host) || !string.Equals(host, "localhost", StringComparison.OrdinalIgnoreCase) || !OperatingSystem.IsWindows())
@@ -227,18 +227,28 @@ public sealed class HistorianClientIntegrationTests
         });
 
         DateTime endUtc = DateTime.UtcNow;
-        DateTime startUtc = endUtc - TimeSpan.FromDays(7);
+        DateTime startUtc = endUtc - TimeSpan.FromDays(30);
 
-        // The event-row WCF wire format is not yet decoded; this test verifies the chain
+        // The full chain (ValCl + Open2 + Retr.IsOriginalAllowed + Retr.StartEventQuery +
-        // (ValCl + Open2 + Retr.IsOriginalAllowed + Retr.StartEventQuery) reaches the server
+        // GetNextEventQueryResultBuffer + HistorianEventRowProtocol.Parse) returns real, parsed
-        // without throwing. An empty event list is acceptable until row parsing is wired.
+        // events. Requires the local store to hold events in the window — System-Platform
+        // alarm/user-write events are present on a working Historian. NOTE: enumeration currently
+        // stops at the first benign `type=4 code=85` soft-terminal, so this verifies parsing
+        // correctness rather than exhaustive retrieval (decoding code 85 to drain all rows is a
+        // separate capture task).
         List<AVEVA.Historian.Client.Models.HistorianEvent> events = [];
         await foreach (AVEVA.Historian.Client.Models.HistorianEvent evt in client.ReadEventsAsync(startUtc, endUtc, CancellationToken.None))
         {
             events.Add(evt);
         }
 
-        Assert.NotNull(events);
+        Assert.NotEmpty(events);
+        Assert.All(events, evt =>
+        {
+            Assert.False(string.IsNullOrWhiteSpace(evt.Type)); // e.g. "User.Write", "Alarm.Set"
+            Assert.NotNull(evt.Properties);
+            Assert.InRange(evt.EventTimeUtc, startUtc - TimeSpan.FromDays(1), endUtc + TimeSpan.FromDays(1));
+        });
     }
 
     [Fact]