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).

src/Drivers/ZB.MOM.WW.OtOpcUa.Driver.AbCip/AbCipStatusMapper.cs

@@ -48,6 +48,7 @@ public static class AbCipStatusMapper
 
     /// <summary>Map a CIP general-status byte to an OPC UA StatusCode.</summary>
     /// <param name="status">The CIP general-status byte value.</param>
+    /// <returns>The corresponding OPC UA StatusCode.</returns>
     public static uint MapCipGeneralStatus(byte status) => status switch
     {
         0x00 => Good,
@@ -72,6 +73,7 @@ public static class AbCipStatusMapper
     ///     operation; every other (negative) member is an error.
     /// </summary>
     /// <param name="status">The libplctag status code as an integer.</param>
+    /// <returns>The corresponding OPC UA StatusCode.</returns>
     public static uint MapLibplctagStatus(int status) => MapLibplctagStatus((Status)status);
 
     /// <summary>
@@ -80,6 +82,7 @@ public static class AbCipStatusMapper
     ///     <see cref="IAbCipTagRuntime.GetStatus"/> seam, which returns the boxed-as-int value.
     /// </summary>
     /// <param name="status">The libplctag Status enum value.</param>
+    /// <returns>The corresponding OPC UA StatusCode.</returns>
     public static uint MapLibplctagStatus(Status status) => status switch
     {
         Status.Ok => Good,