Address code review: alphabetize feature status, improve action docs

Co-authored-by: spboyer <7681382+spboyer@users.noreply.github.com>

Author: Copilot

docs/architecture/command-execution-model.md

@@ -57,7 +57,7 @@ type Action interface {
 }
 ```
 
-Actions receive dependencies via constructor injection through the IoC container. They return an `ActionResult` with a message and optional structured data for output formatting.
+The `ActionResult` contains a `Message` (displayed to the user) and optional structured data used by output formatters (JSON, table). Actions receive dependencies via constructor injection through the IoC container.
 
 ### 5. Output Formatting
 

docs/reference/feature-status.md

@@ -6,18 +6,18 @@ Current maturity status of Azure Developer CLI features. See [Feature Stages](..
 
 | Feature | Stage |
 |---|---|
+| `add` | Beta |
 | `config` | Stable |
 | `deploy` | Stable |
 | `down` | Stable |
 | `env` | Stable |
-| `provision` | Stable |
-| `up` | Stable |
 | `monitor` | Beta |
+| `package` | Beta |
 | `pipeline` | Beta |
+| `provision` | Stable |
 | `restore` | Beta |
 | `template` | Beta |
-| `package` | Beta |
-| `add` | Beta |
+| `up` | Stable |
 
 ## Languages