bug #804 Update Gemini model for examples (chr-hertel)

This PR was merged into the main branch.

Discussion
----------

 Update Gemini model for examples

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

Before:
<img width="1494" height="334" alt="image" src="https://github.com/user-attachments/assets/611e1d0c-0b24-4669-aaae-a27ae8be0e31" />

After:
<img width="1494" height="334" alt="image" src="https://github.com/user-attachments/assets/92a26a24-30c4-4a8a-bdf7-1d8e2d0db054" />

Follow Up: #803

Commits
-------

715ddc3 Update Gemini model for examples

Author: chr-hertel

examples/gemini/audio-input.php

@@ -24,6 +24,6 @@
         Audio::fromFile(dirname(__DIR__, 2).'/fixtures/audio.mp3'),
     ),
 );
-$result = $platform->invoke('gemini-1.5-flash', $messages);
+$result = $platform->invoke('gemini-2.5-flash', $messages);
 
 echo $result->asText().\PHP_EOL;

examples/gemini/image-input.php

@@ -25,6 +25,6 @@
         Image::fromFile(dirname(__DIR__, 2).'/fixtures/image.jpg'),
     ),
 );
-$result = $platform->invoke('gemini-1.5-flash', $messages);
+$result = $platform->invoke('gemini-2.5-flash', $messages);
 
 echo $result->asText().\PHP_EOL;

examples/gemini/pdf-input-binary.php

@@ -24,6 +24,6 @@
         'What is this document about?',
     ),
 );
-$result = $platform->invoke('gemini-1.5-flash', $messages);
+$result = $platform->invoke('gemini-2.5-flash', $messages);
 
 echo $result->asText().\PHP_EOL;

examples/gemini/server-tools.php

@@ -23,7 +23,7 @@
 
 $toolbox = new Toolbox([new Clock()], logger: logger());
 $processor = new AgentProcessor($toolbox);
-$agent = new Agent($platform, 'gemini-2.5-pro-preview-03-25', [$processor], [$processor]);
+$agent = new Agent($platform, 'gemini-2.5-pro', [$processor], [$processor]);
 
 $messages = new MessageBag(
     Message::ofUser(

examples/gemini/structured-output-clock.php

@@ -24,10 +24,10 @@
 $platform = PlatformFactory::create(env('GEMINI_API_KEY'), http_client());
 
 $clock = new Clock(new SymfonyClock());
-$toolbox = new Toolbox([$clock]);
+$toolbox = new Toolbox([$clock], logger: logger());
 $toolProcessor = new ToolProcessor($toolbox);
 $structuredOutputProcessor = new StructuredOutputProcessor();
-$agent = new Agent($platform, 'gemini-1.5-flash', [$toolProcessor, $structuredOutputProcessor], [$toolProcessor, $structuredOutputProcessor]);
+$agent = new Agent($platform, 'gemini-2.5-flash', [$toolProcessor, $structuredOutputProcessor], [$toolProcessor, $structuredOutputProcessor]);
 
 $messages = new MessageBag(Message::ofUser('What date and time is it?'));
 $result = $agent->call($messages, ['response_format' => [

examples/gemini/structured-output-math.php

@@ -21,7 +21,7 @@
 $platform = PlatformFactory::create(env('GEMINI_API_KEY'), http_client());
 
 $processor = new AgentProcessor();
-$agent = new Agent($platform, 'gemini-1.5-flash', [$processor], [$processor]);
+$agent = new Agent($platform, 'gemini-2.5-flash', [$processor], [$processor]);
 $messages = new MessageBag(
     Message::forSystem('You are a helpful math tutor. Guide the user through the solution step by step.'),
     Message::ofUser('how can I solve 8x + 7 = -23'),