tests: ignore *-org directories

[strimo378]

Motivation

• Exclude *-org directories from pytest collection to avoid running third-party or vendored test suites.
• Limit pytest discovery to the tests/ directory to make runs deterministic and faster.
• Ensure test runs focus on the repository's tests as requested.

Description

• Add a root pytest.ini file with testpaths = tests and norecursedirs = *-org.
• The new configuration file is created at the repository root as pytest.ini.
• No other source code changes were made.

Testing

• Ran pytest -n auto -q as the automated test command.
• All tests passed: 21 passed in 6.94s.

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Codex Task