docs: complete XML doc comments via fixdocs (2757 to 131 findings)

Add missing <returns>/<param>/<summary>/<typeparam> tags and clean up
misused inheritdoc across 481 files so the documented API surface is
complete. Documentation-only (zero code lines changed). The 131 remaining
findings are inheritdoc-style warnings deliberately left to preserve
hand-written implementation rationale (plan-decision notes, race-condition
explanations).

tests/Drivers/ZB.MOM.WW.OtOpcUa.Driver.Modbus.Tests/ModbusCoalescingAutoRecoveryTests.cs

@@ -49,11 +49,13 @@ public sealed class ModbusCoalescingAutoRecoveryTests
                 default: return Task.FromResult(new byte[] { pdu[0], 0, 0 });
             }
         }
-        /// <inheritdoc />
+        /// <summary>Releases resources used by this transport instance.</summary>
+        /// <returns>A completed value task.</returns>
         public ValueTask DisposeAsync() => ValueTask.CompletedTask;
     }
 
     /// <summary>Verifies that the first failure falls back to per-tag reads in the same scan.</summary>
+    /// <returns>A task that represents the asynchronous operation.</returns>
     [Fact]
     public async Task First_Failure_Falls_Back_To_PerTag_Same_Scan()
     {
@@ -82,6 +84,7 @@ public sealed class ModbusCoalescingAutoRecoveryTests
     }
 
     /// <summary>Verifies that the second scan skips coalesced reads of prohibited ranges.</summary>
+    /// <returns>A task that represents the asynchronous operation.</returns>
     [Fact]
     public async Task Second_Scan_Skips_Coalesced_Read_Of_Prohibited_Range()
     {
@@ -112,6 +115,7 @@ public sealed class ModbusCoalescingAutoRecoveryTests
     }
 
     /// <summary>Verifies that reprobe clears prohibition when the range becomes healthy.</summary>
+    /// <returns>A task that represents the asynchronous operation.</returns>
     [Fact]
     public async Task Reprobe_Clears_Prohibition_When_Range_Becomes_Healthy()
     {
@@ -142,6 +146,7 @@ public sealed class ModbusCoalescingAutoRecoveryTests
     }
 
     /// <summary>Verifies that reprobe leaves prohibition in place when the range is still bad.</summary>
+    /// <returns>A task that represents the asynchronous operation.</returns>
     [Fact]
     public async Task Reprobe_Leaves_Prohibition_When_Range_Is_Still_Bad()
     {
@@ -166,6 +171,7 @@ public sealed class ModbusCoalescingAutoRecoveryTests
     }
 
     /// <summary>Verifies that GetAutoProhibitedRanges surfaces an operator-visible snapshot.</summary>
+    /// <returns>A task that represents the asynchronous operation.</returns>
     [Fact]
     public async Task GetAutoProhibitedRanges_Surfaces_Operator_Visible_Snapshot()
     {
@@ -199,6 +205,7 @@ public sealed class ModbusCoalescingAutoRecoveryTests
     }
 
     /// <summary>Verifies that tags outside prohibited ranges still coalesce.</summary>
+    /// <returns>A task that represents the asynchronous operation.</returns>
     [Fact]
     public async Task Tags_Outside_Prohibited_Range_Still_Coalesce()
     {