test: rename oold.py to oold_test.py so its tests are collected

[LukasGold]

Renames tests/utils/oold.py to tests/utils/oold_test.py. One-line change, two effects.

The mishap

The file holds 6 real tests for osw.utils.oold, but was named after the module under test rather than after pytest's collection pattern. It matches neither test_*.py nor *_test.py, and the repo overrides no python_files, so pytest never collected it. Its 4 siblings in the same directory all use *_test.py.

The same name caused a second, louder problem. Neither tests/ nor tests/utils/ has an __init__.py, so pytest's default prepend import mode inserts tests/utils/ at sys.path[0]. A bare import oold then resolves to this file, a plain module with no __path__, instead of the installed oold package:

ModuleNotFoundError: No module named 'oold.utils'; 'oold' is not a package

Full-suite runs happened to survive this only by collection-order luck: a top-level tests/*.py file imports osw.* first, which caches the real oold in sys.modules, and the cache then short-circuits the poisoned path. Narrower runs got no such luck. On main:

$ pytest tests/utils/
ERROR tests/utils/templates_test.py
ERROR tests/utils/utils_test.py
ERROR tests/utils/workflow_test.py
3 errors

The fix

Rename to oold_test.py. The basename no longer collides with the installed package, which removes the sys.path shadow, and the file now matches the collection pattern, which enables its tests.

Result

• 6 previously-uncollected tests now run in CI: test_deep_equal, test_unique_array, test_deep_merge, test_merge_jsonld_context_object_list, test_aggregate_generated_schemas, test_escape_json_strings
• all 6 pass, no changes to their bodies were needed
• full default suite: 36 passed -> 42 passed, 1 skipped
• pytest tests/utils/ works for the first time: 29 passed, 1 skipped (was 3 collection errors)

Contents are unchanged; the diff is a pure rename (100% similarity).

[github-actions]

Release preview

No version bump from the current commits (stays at v2.0.0). Use conventional commit types (feat, fix, ...) to trigger a release.

Changelog preview (truncated)

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