test(logging): port logging suite to pytest style

[tmgbedu]

What

Refactors the logging test module (tests/logging/test_logging.py) from unittest into idiomatic pytest style, taking the cleaner ergonomics maintainers liked while keeping the current suite's full breadth and mutation-verified assertions.

Why

The unittest-based suite on main is comprehensive and well-verified, but reads heavier than it needs to (tempfile bookkeeping, redirect_stdout, self.assertX). This ports it to pytest fixtures/assert without losing a single test or weakening any assertion.

Conversions

• unittest.TestCase classes → plain classes with bare assert
• setUpModule / tearDownModule → module-scoped autouse booted_app fixture
• per-class setUp / tearDown → fixtures (isolated_named_root, per-class snapshot_root)
• tempfile.mkstemp / mkdtemp → tmp_path
• redirect_stdout(io.StringIO()) → capsys
• assertRaises → pytest.raises; assertRegex → re.search

Guarantees

• All 52 tests preserved — same assertions, same subsystem coverage (channels, drivers, factories, facade, manager, handler, listener, config, file utils, provider, timezone-aware daily files).
• Full suite: 1650 passed, 7 skipped.
• Coverage 71.18%, clears the 68% fail_under gate.
• ruff format + ruff check clean.
• Net −60 lines.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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