minor #153 [Platform] Enum for Capability instead of class with constants (welcoMattic)

This PR was merged into the main branch.

Discussion
----------

[Platform] Enum for Capability instead of class with constants

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | no <!-- please update src/**/CHANGELOG.md files -->
| Docs?         | no <!-- required for new features -->
| Issues        | Fix #... <!-- prefix each issue number with "Fix #", no need to create an issue if none exist, explain below instead -->
| License       | MIT

Replace #152

Commits
-------

1e06720 Make Capability class an Enum

Author: chr-hertel

src/platform/src/Capability.php

@@ -14,23 +14,23 @@
 /**
  * @author Christopher Hertel <[email protected]>
  */
-class Capability
+enum Capability: string
 {
     // INPUT
-    public const INPUT_AUDIO = 'input-audio';
-    public const INPUT_IMAGE = 'input-image';
-    public const INPUT_MESSAGES = 'input-messages';
-    public const INPUT_MULTIPLE = 'input-multiple';
-    public const INPUT_PDF = 'input-pdf';
-    public const INPUT_TEXT = 'input-text';
+    case INPUT_AUDIO = 'input-audio';
+    case INPUT_IMAGE = 'input-image';
+    case INPUT_MESSAGES = 'input-messages';
+    case INPUT_MULTIPLE = 'input-multiple';
+    case INPUT_PDF = 'input-pdf';
+    case INPUT_TEXT = 'input-text';
 
     // OUTPUT
-    public const OUTPUT_AUDIO = 'output-audio';
-    public const OUTPUT_IMAGE = 'output-image';
-    public const OUTPUT_STREAMING = 'output-streaming';
-    public const OUTPUT_STRUCTURED = 'output-structured';
-    public const OUTPUT_TEXT = 'output-text';
+    case OUTPUT_AUDIO = 'output-audio';
+    case OUTPUT_IMAGE = 'output-image';
+    case OUTPUT_STREAMING = 'output-streaming';
+    case OUTPUT_STRUCTURED = 'output-structured';
+    case OUTPUT_TEXT = 'output-text';
 
     // FUNCTIONALITY
-    public const TOOL_CALLING = 'tool-calling';
+    case TOOL_CALLING = 'tool-calling';
 }

src/platform/src/Model.php

@@ -17,7 +17,7 @@
 class Model
 {
     /**
-     * @param string[]             $capabilities
+     * @param Capability[]         $capabilities
      * @param array<string, mixed> $options
      */
     public function __construct(
@@ -33,14 +33,14 @@ public function getName(): string
     }
 
     /**
-     * @return string[]
+     * @return Capability[]
      */
     public function getCapabilities(): array
     {
         return $this->capabilities;
     }
 
-    public function supports(string $capability): bool
+    public function supports(Capability $capability): bool
     {
         return \in_array($capability, $this->capabilities, true);
     }