doc: add changelog fragments for #14004

Co-authored-by: Cursor AI <ai@cursor.sh>
Co-authored-by: Anthropic Claude Opus 4 <claude@anthropic.com>

Author: 3 people

changelog/14004.bugfix.rst

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+Fixed conftest.py fixture scoping when ``testpaths`` points outside ``rootdir``.
+
+Previously, fixtures from nested conftest.py files would incorrectly leak to sibling directories
+when using a relative ``testpaths`` like ``../tests/sdk``.
+
+Conftest fixtures are now parsed during Directory collection, using the Directory node's
+nodeid for proper scoping.

changelog/14004.deprecation.rst

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+Passing ``baseid`` to :class:`~pytest.FixtureDef` or ``nodeid`` strings to fixture registration
+APIs is now deprecated.
+
+Use the ``node`` parameter instead for fixture scoping. This enables more robust node-based
+matching instead of string prefix matching.
+
+This will be removed in pytest 10.