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/S7AddressBuilderTests.cs

@@ -6,6 +6,12 @@ namespace ZB.MOM.WW.OtOpcUa.AdminUI.Tests.Pickers;
 
 public sealed class S7AddressBuilderTests
 {
+    /// <summary>Verifies that Build produces the canonical S7 address string for all supported areas and types.</summary>
+    /// <param name="area">The S7 memory area (DB / M / I / Q).</param>
+    /// <param name="dbNumber">The DB number (relevant only for the DB area).</param>
+    /// <param name="offset">The byte offset within the area.</param>
+    /// <param name="s7Type">The S7 data type qualifier (X / B / W / D / REAL).</param>
+    /// <param name="expected">The expected canonical address string.</param>
     [Theory]
     [InlineData("DB", 10, 20, "REAL", "DB10.DBD20:REAL")]
     [InlineData("DB", 1, 0, "X", "DB1.DBX0.0:X")]