docs: backfill XML documentation across 756 files

Adds <summary>, <param>, <typeparam>, and <inheritdoc/> tags to public
members surfaced by commentchecker — resolves 5,847 of 5,869 issues
(99.6%) across three /fixdocs passes.

tests/Drivers/ZB.MOM.WW.OtOpcUa.Driver.AbLegacy.Tests/AbLegacyAddressTests.cs

@@ -7,6 +7,13 @@ namespace ZB.MOM.WW.OtOpcUa.Driver.AbLegacy.Tests;
 [Trait("Category", "Unit")]
 public sealed class AbLegacyAddressTests
 {
+    /// <summary>Verifies that TryParse accepts valid PCCC addresses.</summary>
+    /// <param name="input">The raw PCCC address string to parse.</param>
+    /// <param name="letter">The expected file letter.</param>
+    /// <param name="file">The expected file number, or null for I/O/S files.</param>
+    /// <param name="word">The expected word number.</param>
+    /// <param name="bit">The expected bit index, or null if no bit is specified.</param>
+    /// <param name="sub">The expected sub-element name, or null if absent.</param>
     [Theory]
     [InlineData("N7:0", "N", 7, 0, null, null)]
     [InlineData("N7:15", "N", 7, 15, null, null)]
@@ -34,6 +41,8 @@ public sealed class AbLegacyAddressTests
         a.SubElement.ShouldBe(sub);
     }
 
+    /// <summary>Verifies that TryParse rejects invalid address forms.</summary>
+    /// <param name="input">The invalid address string to test, or null.</param>
     [Theory]
     [InlineData(null)]
     [InlineData("")]
@@ -51,6 +60,8 @@ public sealed class AbLegacyAddressTests
         AbLegacyAddress.TryParse(input).ShouldBeNull();
     }
 
+    /// <summary>Verifies that ToLibplctagName correctly roundtrips addresses.</summary>
+    /// <param name="input">The PCCC address string to roundtrip.</param>
     [Theory]
     [InlineData("N7:0")]
     [InlineData("F8:5")]
@@ -68,12 +79,16 @@ public sealed class AbLegacyAddressTests
 
     // ---- Driver.AbLegacy-003: Parser tightening ----
 
+    /// <summary>Verifies that TryParse rejects addresses with both sub-element and bit index.</summary>
+    /// <param name="input">The PCCC address string to test.</param>
     [Theory]
     [InlineData("T4:0.ACC/2")]      // sub-element + bit index — never valid in PCCC
     [InlineData("C5:0.PRE/3")]
     public void TryParse_rejects_subelement_plus_bitindex(string input) =>
         AbLegacyAddress.TryParse(input).ShouldBeNull();
 
+    /// <summary>Verifies that TryParse rejects file numbers on system files (I, O, S).</summary>
+    /// <param name="input">The PCCC address string to test.</param>
     [Theory]
     [InlineData("I3:0")]            // I is a system file — no file number allowed
     [InlineData("O2:1")]
@@ -81,6 +96,8 @@ public sealed class AbLegacyAddressTests
     public void TryParse_rejects_file_number_on_IOS_files(string input) =>
         AbLegacyAddress.TryParse(input).ShouldBeNull();
 
+    /// <summary>Verifies that TryParse rejects sub-element specifications on non-structured files.</summary>
+    /// <param name="input">The PCCC address string to test.</param>
     [Theory]
     [InlineData("B3:0.DN")]         // B (bit) file has no structured elements
     [InlineData("N7:0.FOO")]        // N (integer) file has no structured elements
@@ -89,6 +106,8 @@ public sealed class AbLegacyAddressTests
     public void TryParse_rejects_subelement_on_non_structured_file(string input) =>
         AbLegacyAddress.TryParse(input).ShouldBeNull();
 
+    /// <summary>Verifies that TryParse accepts sub-element specifications only on T, C, and R files.</summary>
+    /// <param name="input">The PCCC address string to test.</param>
     [Theory]
     [InlineData("T4:0.ACC")]        // T, C, R are the only structured-element files
     [InlineData("C5:0.PRE")]
@@ -96,6 +115,8 @@ public sealed class AbLegacyAddressTests
     public void TryParse_accepts_subelement_only_on_TCR_files(string input) =>
         AbLegacyAddress.TryParse(input).ShouldNotBeNull();
 
+    /// <summary>Verifies that TryParse accepts I, O, and S addresses without file numbers.</summary>
+    /// <param name="input">The PCCC address string to test.</param>
     [Theory]
     [InlineData("I:0/0")]           // I/O/S without file number are valid
     [InlineData("O:1/2")]