docs: backfill XML documentation across 756 files

Adds <summary>, <param>, <typeparam>, and <inheritdoc/> tags to public
members surfaced by commentchecker — resolves 5,847 of 5,869 issues
(99.6%) across three /fixdocs passes.

tests/Drivers/ZB.MOM.WW.OtOpcUa.Driver.AbLegacy.IntegrationTests/AbLegacyReadSmokeTests.cs

@@ -22,6 +22,7 @@ public sealed class AbLegacyReadSmokeTests(AbLegacyServerFixture sim)
     // filters to that profile alone so the suite matches the running container. Unset
     // (the default for real-hardware runs) parameterises across every family the driver
     // supports.
+    /// <summary>Gets the available server profiles based on compose configuration.</summary>
     public static IEnumerable<object[]> Profiles
     {
         get
@@ -34,6 +35,8 @@ public sealed class AbLegacyReadSmokeTests(AbLegacyServerFixture sim)
         }
     }
 
+    /// <summary>Verifies that the driver reads seeded N file from the AB server via PCCC.</summary>
+    /// <param name="profile">The AB Legacy server profile describing the fixture endpoint.</param>
     [AbLegacyTheory]
     [MemberData(nameof(Profiles))]
     public async Task Driver_reads_seeded_N_file_from_ab_server_PCCC(AbLegacyServerProfile profile)
@@ -69,6 +72,7 @@ public sealed class AbLegacyReadSmokeTests(AbLegacyServerFixture sim)
         drv.GetHealth().State.ShouldBe(DriverState.Healthy);
     }
 
+    /// <summary>Verifies that SLC500 write-then-read round trip succeeds on N7 scratch register.</summary>
     [AbLegacyFact]
     public async Task Slc500_write_then_read_round_trip_on_N7_scratch_register()
     {