Add code-gen analyzer & update pipeline workflow diagram

Added code-generation analyzer package to improve code quality for pipeline features. Updated Mermaid diagram in features-pipelines.md to clarify the "Small local workflow" by correcting the method call to services.AddPipelines.WithPipeline for consistency and accuracy.

Author: vp

docs/features-pipelines.md

@@ -189,7 +189,7 @@ flowchart TD
     A[Developer] --> B{How to define pipeline?}
     B -->|Reusable feature workflow| C[PipelineDefinition<TContext>]
     B -->|Programmatic definition| D[PipelineDefinitionBuilder<TContext>]
-    B -->|Small local workflow| E[services.AddPipelines().WithPipeline(...)]
+    B -->|Small local workflow| E[services.AddPipelines.WithPipeline]
 
     C --> F[Register packaged pipeline]
     D --> G[Build IPipelineDefinition]