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/Server/ZB.MOM.WW.OtOpcUa.AdminUI.Tests/Pickers/AbLegacyAddressBuilderTests.cs

@@ -6,6 +6,11 @@ namespace ZB.MOM.WW.OtOpcUa.AdminUI.Tests.Pickers;
 
 public sealed class AbLegacyAddressBuilderTests
 {
+    /// <summary>Verifies that Build_Canonical returns the expected canonical address string for each file type.</summary>
+    /// <param name="fileType">The file type letter (e.g., N, B, F).</param>
+    /// <param name="fileNumber">The file number.</param>
+    /// <param name="element">The element index within the file.</param>
+    /// <param name="expected">The expected canonical address string.</param>
     [Theory]
     [InlineData("N", 7, 0, "N7:0")]
     [InlineData("B", 3, 1, "B3:1")]