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/Drivers/ZB.MOM.WW.OtOpcUa.Driver.Galaxy.Tests/Browse/DeployWatcherTests.cs

@@ -120,6 +120,7 @@ public sealed class DeployWatcherTests
     }
 
     /// <summary>Verifies that bootstrap deploy events are suppressed.</summary>
+    /// <returns>A task that represents the asynchronous operation.</returns>
     [Fact]
     public async Task BootstrapEventIsSuppressed()
     {
@@ -143,6 +144,7 @@ public sealed class DeployWatcherTests
     }
 
     /// <summary>Verifies that a deployment time change fires a rediscovery event.</summary>
+    /// <returns>A task that represents the asynchronous operation.</returns>
     [Fact]
     public async Task DeployTimeChangeFiresRediscover()
     {
@@ -171,6 +173,7 @@ public sealed class DeployWatcherTests
     }
 
     /// <summary>Verifies that the same deployment time does not fire a rediscovery event.</summary>
+    /// <returns>A task that represents the asynchronous operation.</returns>
     [Fact]
     public async Task SameDeployTimeDoesNotFire()
     {
@@ -195,6 +198,7 @@ public sealed class DeployWatcherTests
     }
 
     /// <summary>Verifies that a deployment time presence flip fires a rediscovery event.</summary>
+    /// <returns>A task that represents the asynchronous operation.</returns>
     [Fact]
     public async Task TimeOfLastDeployPresentFlipFiresRediscover()
     {
@@ -222,6 +226,7 @@ public sealed class DeployWatcherTests
     }
 
     /// <summary>Verifies that stop cancels the watcher loop cleanly.</summary>
+    /// <returns>A task that represents the asynchronous operation.</returns>
     [Fact]
     public async Task StopCancelsLoopCleanly()
     {
@@ -243,6 +248,7 @@ public sealed class DeployWatcherTests
     }
 
     /// <summary>Verifies that disposing stops a running watcher.</summary>
+    /// <returns>A task that represents the asynchronous operation.</returns>
     [Fact]
     public async Task DisposeStopsRunningWatcher()
     {
@@ -262,6 +268,7 @@ public sealed class DeployWatcherTests
     }
 
     /// <summary>Verifies that a source exception triggers retry with backoff.</summary>
+    /// <returns>A task that represents the asynchronous operation.</returns>
     [Fact]
     public async Task SourceExceptionTriggersRetryWithBackoff()
     {