Add ReasoningEffort configuration support

[Copilot]

Adds reasoning effort configuration to align with official SDK v0.0.400. Reasoning effort controls computational intensity for models that support it (low, medium, high, xhigh).

Changes

• New ReasoningEffort enum - String-backed enum for type safety with flexible string fallback
• SessionConfig / ResumeSessionConfig - Added reasoningEffort property accepting enum or string, auto-converts to string for server
• ModelCapabilities - Added supportsReasoningEffort() method
• ModelInfo - Added supportedReasoningEfforts array and defaultReasoningEffort properties
• Client - Pass reasoningEffort to server in createSession() and resumeSession()

Usage

use Revolution\Copilot\Enums\ReasoningEffort;

// Type-safe enum
Copilot::run(
    prompt: 'Explain quantum computing',
    config: ['reasoningEffort' => ReasoningEffort::HIGH]
);

// Or string
Copilot::run(
    prompt: 'Explain quantum computing',
    config: ['reasoningEffort' => 'high']
);

// Check model support
$models = Copilot::client()->listModels();
foreach ($models as $model) {
    if ($model->capabilities->supportsReasoningEffort()) {
        echo "Default: {$model->defaultReasoningEffort}\n";
    }
}

Enums convert to strings automatically when sent to server. Fully backward compatible.

Original prompt

github/copilot-sdk#302 公式SDKのアップデートに追従。ReasoningEffortはEnumで定義。SessionConfigではenumでもstringでも受け入れてcreateSessionで使うときにstringにする。

Custom agent used: laravel-sdk-sync
Use this agent when the user wants to update the Laravel Copilot SDK to follow official GitHub Copilot CLI SDK changes.

Trigger phrases include:

• 'update the SDK to match the official version'
• 'sync the Laravel SDK with the latest official release'
• 'what changed in the official SDK and how do we update?'
• 'implement the breaking changes from the official SDK'
  ... see config here

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