ci: add a smoke test running outside of the default virtual env

[ishymko]

• Adds a CI workflow that builds and installs a2a-sdk with only base dependencies (no extras or dev group) and verifies all core public API modules import successfully.
• Prevents regressions like feat: A2A Version Header validation on server side. #865 (fixed in fix: Add packaging to base dependencies #897) where packaging was used in core modules but missing from [project.dependencies]. Since packaging is a transitive dependency of several dev tools, it was always available in CI but not for end-users doing pip install a2a-sdk.

Added a workflow which:

1. Builds the package wheel.
2. Creates a clean venv and installs only the wheel.
3. Runs the import smoke test script against that clean venv.

Tested:

• Reverting packaging from fix: Add packaging to base dependencies #897 gives expected failure.
• [Bug]: The SDK has a SQL Alchemy dependency even when not using any SQL capability. #883: failed, fix: fix: Remove unconditional SQLAlchemy dependency from SDK core #898.

[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 enhances the project's continuous integration by adding a crucial smoke test. This test specifically targets minimal installations of the a2a-sdk, ensuring that all core public API modules are importable without any optional or development dependencies. This proactive measure aims to prevent issues where users performing a basic pip install might encounter missing dependency errors, thereby improving the reliability and user experience of the SDK.

Highlights

• New CI Workflow: Introduced a new CI workflow that builds and installs a2a-sdk with only base dependencies and verifies core public API modules import successfully.
• Dependency Regression Prevention: Addresses and prevents regressions where core modules might rely on transitive dependencies not explicitly listed, ensuring a minimal pip install works as expected.

Ignored Files

• Ignored by pattern: .github/workflows/** (1)
  • .github/workflows/minimal-install.yml

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[gemini-code-assist]

Code Review

This pull request introduces a new smoke test script, scripts/test_minimal_install.py, which verifies that all core a2a-sdk modules can be imported successfully with only base dependencies. The script iterates through a predefined list of CORE_MODULES and reports any import failures. Feedback suggests sorting the CORE_MODULES list alphabetically to enhance maintainability and simplify future modifications.

[github-actions]

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