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/FocasAddressBuilderTests.cs

@@ -6,6 +6,10 @@ namespace ZB.MOM.WW.OtOpcUa.AdminUI.Tests.Pickers;
 
 public sealed class FocasAddressBuilderTests
 {
+    /// <summary>Verifies that Build produces the canonical group:parameterId address string.</summary>
+    /// <param name="group">The FOCAS parameter group name.</param>
+    /// <param name="parameterId">The FOCAS parameter ID.</param>
+    /// <param name="expected">The expected canonical address string.</param>
     [Theory]
     [InlineData("axis", 5, "axis:5")]
     [InlineData("spindle", 0, "spindle:0")]