Make CLI input robust (EOF/empty) and add pytest configuration

[vepretski]

Motivation

• Ensure the simple CLI in src/main.py behaves sensibly in non-interactive environments by providing a default name and avoiding crashes on EOF or empty input.
• Provide a basic pytest configuration so test discovery and execution are consistent across environments.

Description

• Added pytest.ini to set pythonpath = . and testpaths = tests to configure pytest discovery.
• Updated src/main.py to strip() the result of input(), catch EOFError, and default the user name to "Builder" when input is empty or unavailable.
• When input is unavailable (EOFError) the code now prints a short auto-fill message and proceeds without raising an exception.
• No changes were made to get_greeting; it continues to return a personalised greeting string.

Testing

• Added pytest.ini and ran pytest -q to validate test discovery, which completed successfully with no tests collected.

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Codex Task