Enhance Testing and Robustness for Claude CLI Auth

[google-labs-jules]

Implemented the "Operace 100% Confidence" plan for claude-cli-auth.

Key changes:

1. Environment Validation: Added scripts/check_env.py to quickly verify Node.js, Claude CLI installation, and authentication status.
2. Unit Testing: Added tests/test_cli_parsing.py to verify JSON stream parsing from Claude CLI using reverse-engineered mock data. Fixed _parse_error_update logic in cli_interface.py to handle nested error objects correctly.
3. Config & Fallback Tests: Added tests/test_config_fallback.py to validate AuthConfig and verify ClaudeAuthManager's fallback mechanism (SDK -> CLI).
4. E2E Testing: Implemented tests/test_e2e_live.py covering basic connectivity, session memory, file context reading, streaming callbacks, and error recovery. These tests run only when RUN_LIVE_TESTS=1.
5. Robustness Testing: Added tests/test_robustness.py for timeout handling, invalid session recovery, and cleanup.
6. Code Fixes: Resolved TypeError in logging calls within cli_interface.py and auth_manager.py (incorrect use of kwargs in standard logging).
7. Documentation: Updated README.md with a "Running Tests" section.

Verification:

• Unit tests (test_cli_parsing.py, test_config_fallback.py, test_robustness.py, test_basic.py) pass.
• E2E tests (test_e2e_live.py) are implemented and skip gracefully if authentication is missing (verified in sandbox).
• poetry build succeeds and artifacts contain necessary files.

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PR created automatically by Jules for task 17351748420936954100 started by @milhy545

[google-labs-jules]

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[milhy545]

@gemini-cli /review