minor #639 [Agent] Use named arguments for exception previous parameter (OskarStark)

This PR was merged into the main branch.

Discussion
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[Agent] Use named arguments for exception previous parameter

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | no
| Docs?         | no
| Issues        | --
| License       | MIT

Remove unnecessary 0 code parameter and use named 'previous' argument for better code readability in RuntimeException constructors.

Commits
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e6c9274 refactor: Use named arguments for exception previous parameter

Author: OskarStark

src/platform/src/Bridge/Gemini/Gemini/ResultConverter.php

@@ -92,7 +92,7 @@ private function convertStream(HttpResponse $result): \Generator
                 try {
                     $data = json_decode($delta, true, 512, \JSON_THROW_ON_ERROR);
                 } catch (\JsonException $e) {
-                    throw new RuntimeException('Failed to decode JSON response.', 0, $e);
+                    throw new RuntimeException('Failed to decode JSON response.', previous: $e);
                 }
 
                 $choices = array_map($this->convertChoice(...), $data['candidates'] ?? []);

src/platform/src/Bridge/VertexAi/Gemini/ResultConverter.php

@@ -91,7 +91,7 @@ private function convertStream(HttpResponse $result): \Generator
                 try {
                     $data = json_decode($delta, true, 512, \JSON_THROW_ON_ERROR);
                 } catch (\JsonException $e) {
-                    throw new RuntimeException('Failed to decode JSON response.', 0, $e);
+                    throw new RuntimeException('Failed to decode JSON response.', previous: $e);
                 }
 
                 $choices = array_map($this->convertChoice(...), $data['candidates'] ?? []);