[sdk-sync] Sync with copilot-sdk: add agent parameter and onListModels handler

[github-actions]

Official SDK Commit Range

396e8b3..e478657 (compare on GitHub)

Summary of Changes Detected

Two new features from the official SDK (commits 7766b1a and e478657):

1. agent parameter in SessionConfig / ResumeSessionConfig — lets callers pre-select a custom agent by name when creating or resuming a session, without needing a follow-up session.rpc.agent.select() call.

2. onListModels handler in CopilotClientOptions — a custom callable for BYOK mode: when set, client.listModels() calls the handler instead of querying the CLI server. Useful when the CLI is not connected but model metadata is still needed.

Laravel Files Modified

File	Change
copilot-sdk	Submodule pointer updated to e478657
src/Types/SessionConfig.php	Added agent?: string property
src/Types/ResumeSessionConfig.php	Added agent?: string property
src/Client.php	Added $onListModels property; updated constructor to read on_list_models from options; updated listModels() to call custom handler first; added agent to session.create and session.resume RPC payloads
docs/jp/session-config.md	Documented the new agent parameter
docs/jp/custom-providers.md	Documented the new on_list_models option

Breaking Changes

None. All new fields are optional (?string, ?callable). Existing code continues to work unchanged.

Usage Examples

// Pre-select a custom agent when creating a session
$response = Copilot::run(
    prompt: 'Review this code',
    config: new SessionConfig(
        customAgents: [['name' => 'reviewer', ...]],
        agent: 'reviewer', // activate immediately on session start
    ),
);

// BYOK: provide models without connecting to CLI
$models = Copilot::client()->usingListModels(function (): array {
    return [
        ['id' => 'my-model-1', 'name' => 'My Model 1', 'version' => '1.0'],
        ['id' => 'my-model-2', 'name' => 'My Model 2', 'version' => '2.0'],
    ];
})->listModels(); // no CLI connection required

Generated by SDK Sync · ◷

[Copilot]

@kawax I've opened a new pull request, #33, to work on those changes. Once the pull request is ready, I'll request review from you.

[Copilot]

@kawax I've opened a new pull request, #34, to work on those changes. Once the pull request is ready, I'll request review from you.

[kawax]

@copilot テストを追加

[Copilot]

@kawax I've opened a new pull request, #35, to work on those changes. Once the pull request is ready, I'll request review from you.