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.AbCip.Tests/AbCipUdtReadPlannerTests.cs

@@ -8,6 +8,7 @@ public sealed class AbCipUdtReadPlannerTests
 {
     private const string Device = "ab://10.0.0.1/1,0";
 
+    /// <summary>Verifies two members of the same UDT parent are grouped.</summary>
     [Fact]
     public void Groups_Two_Members_Of_The_Same_Udt_Parent()
     {
@@ -20,6 +21,7 @@ public sealed class AbCipUdtReadPlannerTests
         plan.Fallbacks.Count.ShouldBe(0);
     }
 
+    /// <summary>Verifies single member reference falls back to per-tag path.</summary>
     [Fact]
     public void Single_Member_Reference_Falls_Back_To_Per_Tag_Path()
     {
@@ -33,6 +35,7 @@ public sealed class AbCipUdtReadPlannerTests
         plan.Fallbacks[0].Reference.ShouldBe("Motor.Speed");
     }
 
+    /// <summary>Verifies unknown references fall back without affecting groups.</summary>
     [Fact]
     public void Unknown_References_Fall_Back_Without_Affecting_Groups()
     {
@@ -47,6 +50,7 @@ public sealed class AbCipUdtReadPlannerTests
         plan.Fallbacks.ShouldContain(f => f.Reference == "Motor.NonMember");
     }
 
+    /// <summary>Verifies atomic top-level tags fall back untouched.</summary>
     [Fact]
     public void Atomic_Top_Level_Tag_Falls_Back_Untouched()
     {
@@ -62,6 +66,7 @@ public sealed class AbCipUdtReadPlannerTests
         plan.Fallbacks[0].Reference.ShouldBe("PlainDint");
     }
 
+    /// <summary>Verifies UDT with bool member does not group.</summary>
     [Fact]
     public void Udt_With_Bool_Member_Does_Not_Group()
     {
@@ -88,6 +93,7 @@ public sealed class AbCipUdtReadPlannerTests
         plan.Fallbacks.Count.ShouldBe(2);
     }
 
+    /// <summary>Verifies original indices are preserved for out-of-order batches.</summary>
     [Fact]
     public void Original_Indices_Preserved_For_Out_Of_Order_Batches()
     {