feat: add status, auth, and models metadata APIs to all SDKs

[friggeri]

Add three new methods to query CLI metadata:

• getStatus/get_status/GetStatus/GetStatusAsync - CLI version and protocol info
• getAuthStatus/get_auth_status/GetAuthStatus/GetAuthStatusAsync - Auth state
• listModels/list_models/ListModels/ListModelsAsync - Available models with metadata

Implements #61

Bump protocol version to 2 to match copilot-agent-runtime.

---

This requires us to update the deps to point to a new pre-release of the CLI, will update this PR when done

[Copilot]

Pull request overview

This pull request adds three new metadata query APIs to all SDKs (Python, Node.js, Go, and .NET) for retrieving CLI status, authentication state, and available models information. The protocol version is bumped from 1 to 2 to maintain compatibility with the copilot-agent-runtime.

Changes:

• Added getStatus/get_status/GetStatus/GetStatusAsync method to retrieve CLI version and protocol version
• Added getAuthStatus/get_auth_status/GetAuthStatus/GetAuthStatusAsync method to query authentication state
• Added listModels/list_models/ListModels/ListModelsAsync method to retrieve available models with metadata
• Updated protocol version from 1 to 2 in sdk-protocol-version.json
• Updated test snapshots to reflect minor changes in assistant responses

Reviewed changes

Copilot reviewed 12 out of 12 changed files in this pull request and generated 6 comments.

Show a summary per file

File	Description
sdk-protocol-version.json	Bumps protocol version from 1 to 2 to match agent runtime
test/snapshots/session/should_abort_a_session.yaml	Updates test snapshots with minor response text changes
python/copilot/types.py	Adds type definitions for status, auth, and model metadata responses
python/copilot/client.py	Implements three new async methods for metadata queries
python/copilot/init.py	Exports new public types for external use
nodejs/src/types.ts	Adds TypeScript interface definitions for new API responses
nodejs/src/client.ts	Implements three new async methods for metadata queries
nodejs/src/index.ts	Exports new public types for external use
go/types.go	Adds Go struct definitions for new API responses
go/client.go	Implements three new methods with proper error handling
dotnet/src/Types.cs	Adds C# class definitions with JSON serialization attributes
dotnet/src/Client.cs	Implements three new async methods with cancellation token support

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.