docs: add XML documentation and ConfigManager implementation plans

Add comprehensive XML documentation (param/returns tags) across 132 source
files to improve IntelliSense and API discoverability. Include ConfigManager
design documents and implementation plans for phases 1-9.

NEW/src/JdeScoping.Api/Controllers/PipelineController.cs

@@ -20,6 +20,12 @@ public class PipelineController : ApiControllerBase
     private readonly IDataUpdateRepository _dataUpdateRepository;
     private readonly IPipelineMapper _mapper;
 
+    /// <summary>
+    /// Initializes a new instance of the <see cref="PipelineController"/> class.
+    /// </summary>
+    /// <param name="pipelineFactory">The ETL pipeline factory.</param>
+    /// <param name="dataUpdateRepository">The data update repository.</param>
+    /// <param name="mapper">The pipeline mapper.</param>
     public PipelineController(
         IEtlPipelineFactory pipelineFactory,
         IDataUpdateRepository dataUpdateRepository,
@@ -45,6 +51,7 @@ public class PipelineController : ApiControllerBase
     /// <summary>
     /// Gets configuration for a specific pipeline.
     /// </summary>
+    /// <param name="name">The pipeline name.</param>
     [HttpGet(ApiRoutes.Pipelines.ByName)]
     public ActionResult<PipelineConfigDto> GetPipeline(string name)
     {
@@ -60,6 +67,8 @@ public class PipelineController : ApiControllerBase
     /// <summary>
     /// Gets schedule status for a pipeline.
     /// </summary>
+    /// <param name="name">The pipeline name.</param>
+    /// <param name="cancellationToken">The cancellation token.</param>
     [HttpGet(ApiRoutes.Pipelines.Status)]
     public async Task<ActionResult<PipelineStatusResponse>> GetStatus(
         string name,
@@ -104,6 +113,9 @@ public class PipelineController : ApiControllerBase
     /// <summary>
     /// Gets recent execution history for a pipeline.
     /// </summary>
+    /// <param name="name">The pipeline name.</param>
+    /// <param name="count">The maximum number of recent executions to retrieve.</param>
+    /// <param name="cancellationToken">The cancellation token.</param>
     [HttpGet(ApiRoutes.Pipelines.Executions)]
     public async Task<ActionResult<PipelineExecutionsResponse>> GetExecutions(
         string name,