docs: complete XML doc coverage (returns, summaries, inheritdoc)

Resolve all 622 issues flagged by the enhanced CommentChecker: add missing
<returns> tags (incl. the standard phrasing on non-generic Task methods),
add missing <summary> tags, and replace misused/redundant <inheritdoc/> on
members that override or implement nothing with real documentation.
Documentation-only — no behavior change; solution builds clean.

src/ZB.MOM.WW.ScadaBridge.DeploymentManager/DeploymentService.cs

@@ -137,6 +137,7 @@ public class DeploymentService
     /// <param name="instanceId">The database ID of the instance to deploy.</param>
     /// <param name="user">The username initiating the deployment, recorded in the audit log.</param>
     /// <param name="cancellationToken">Cancellation token for the operation.</param>
+    /// <returns>A task that resolves to a success result containing the deployment record, or a failure result with an error message.</returns>
     public async Task<Result<DeploymentRecord>> DeployInstanceAsync(
         int instanceId,
         string user,
@@ -335,6 +336,7 @@ public class DeploymentService
     /// <param name="instanceId">The database ID of the instance to disable.</param>
     /// <param name="user">The username initiating the operation, recorded in the audit log.</param>
     /// <param name="cancellationToken">Cancellation token for the operation.</param>
+    /// <returns>A task that resolves to a success result with the site response, or a failure result with an error message.</returns>
     public async Task<Result<InstanceLifecycleResponse>> DisableInstanceAsync(
         int instanceId,
         string user,
@@ -404,6 +406,7 @@ public class DeploymentService
     /// <param name="instanceId">The database ID of the instance to enable.</param>
     /// <param name="user">The username initiating the operation, recorded in the audit log.</param>
     /// <param name="cancellationToken">Cancellation token for the operation.</param>
+    /// <returns>A task that resolves to a success result with the site response, or a failure result with an error message.</returns>
     public async Task<Result<InstanceLifecycleResponse>> EnableInstanceAsync(
         int instanceId,
         string user,
@@ -472,6 +475,7 @@ public class DeploymentService
     /// <param name="instanceId">The database ID of the instance to delete.</param>
     /// <param name="user">The username initiating the deletion, recorded in the audit log.</param>
     /// <param name="cancellationToken">Cancellation token for the operation.</param>
+    /// <returns>A task that resolves to a success result with the site response, or a failure result with an error message.</returns>
     public async Task<Result<InstanceLifecycleResponse>> DeleteInstanceAsync(
         int instanceId,
         string user,
@@ -568,6 +572,7 @@ public class DeploymentService
     /// </summary>
     /// <param name="instanceId">The database ID of the instance to compare.</param>
     /// <param name="cancellationToken">Cancellation token for the operation.</param>
+    /// <returns>A task that resolves to a success result with the comparison, or a failure result if no snapshot exists.</returns>
     public async Task<Result<DeploymentComparisonResult>> GetDeploymentComparisonAsync(
         int instanceId,
         CancellationToken cancellationToken = default)
@@ -636,6 +641,7 @@ public class DeploymentService
     /// </summary>
     /// <param name="deploymentId">The unique deployment identifier to look up.</param>
     /// <param name="cancellationToken">Cancellation token for the operation.</param>
+    /// <returns>A task that resolves to the matching deployment record, or null if none exists.</returns>
     public async Task<DeploymentRecord?> GetDeploymentStatusAsync(
         string deploymentId,
         CancellationToken cancellationToken = default)