[qorud02]

Addresses #802.

Replace the six repeated positive/negative/zero temperature-conversion tests in each example with two parametrized tests, following the discussion in #659. Keep named cases and the negative Celsius result for 0°F; use pytest.approx with the existing absolute tolerance.

The Hatch-only averaging/workflow examples and the fixture-based annual-mean tests stay in place. The two excerpts included by tests/test-types.md are byte-identical to the originals.

Validation:

• Each package runs in a separate Python process: Hatch 11 tests and setuptools 8 tests pass.
• Ruff checks pass using the example-specific configuration.
• nox -e docs-test passes, including the strict English build and the notified release-language builds.
• Verification run. Both changed files match the tested blobs; verification workflow changes stay on a separate fork branch.

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