Add fixture tag selection

[mavam]

🔍 Problem

• --match can select tests by path, but there was no stable way to select tests by fixture behavior.
• Running only container-backed or Docker Compose tests required relying on naming conventions.

🛠️ Solution

• Add --fixture-tag and the matching fixture_tags Python API parameter.
• Add fixture tag metadata with inference from tagged abstractions.
• Tag container_runtime as container and the built-in Docker Compose fixture as container and docker-compose.
• Add a changelog entry for the new selector.

💬 Review

• The main design point is that tags come from abstractions by default, while explicit tags= remains available for custom fixtures.
• --fixture-tag intersects with path and --match selection and expands suites the same way as --match.

Checks:

uv run ruff check
uv run ruff format --check
uv run mypy
uv run pytest

_{📚 Docs PR: tenzir/docs#305}

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

💡 Codex Review

test/src/tenzir_test/run.py

Line 6727 in 5bcb8fc

collected_paths = _expand_suites(collected_paths)

Apply all selectors before expanding suites

Expanding suites immediately after --match filtering lets tests bypass intersection semantics when --fixture-tag is also used: if test A in a suite matches the path/pattern selector and test B in the same suite matches the fixture tag selector, the first expansion adds B before tag filtering, then the second expansion re-adds A, so the suite runs even though no individual test matched both selectors. This contradicts the documented "intersection" behavior for combined selectors and can make targeted runs execute unrelated tests.

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[chatgpt-codex-connector]

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[chatgpt-codex-connector]

💡 Codex Review

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Reviewed commit: c853bb4744

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