fix: replace stale entry in a2a.types.__all__ with actual import name

[ishymko]

• Fix stale __all__ entry in src/a2a/types/__init__.py: AuthenticatedExtendedCardNotConfiguredError does not exist in the module namespace - the actual import is ExtendedAgentCardNotConfiguredError. This caused AttributeError at runtime on from a2a.types import * or any direct reference to the listed name.
• Enable ruff's F822 rule for __init__.py files by adding preview = true and explicit-preview-rules = true under [tool.ruff.lint]. This prevents stale __all__ entries from going undetected in the future, without introducing any new preview-only rules.

[gemini-code-assist]

Summary of Changes

Hello, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request addresses a critical runtime error stemming from an incorrect export name in a module's 'all' definition. It rectifies the specific erroneous entry and proactively enhances the project's linting configuration to automatically detect and prevent similar issues in the future, ensuring better code maintainability and stability.

Highlights

• Corrected all entry: Replaced a stale entry 'AuthenticatedExtendedCardNotConfiguredError' with the correct 'ExtendedAgentCardNotConfiguredError' in 'src/a2a/types/init.py' to resolve runtime AttributeErrors.
• Enhanced linting: Enabled Ruff's 'F822' rule for 'init.py' files by setting 'preview = true' and 'explicit-preview-rules = true' in 'pyproject.toml', preventing future 'all' entry discrepancies.

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[gemini-code-assist]

Code Review

This pull request updates the pyproject.toml to enable Ruff's preview mode and explicitly enable preview rules. Additionally, it modifies the src/a2a/types/__init__.py file to reflect a change in an error type, replacing AuthenticatedExtendedCardNotConfiguredError with ExtendedAgentCardNotConfiguredError in the module's public exports. There are no review comments to address.

[github-actions]

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