from importlib.abc import Traversable doesn't work with Python >=3.14

[leodr]

In a freshly created lab/env with a simple setup prime eval crashes because of this import

from importlib.abc import Traversable

This was relocated in Python 3.14 to from importlib.resources.abc import Traversable and is used in 8 places across the repo.

Codex said you could use this instead:

try:
    from importlib.resources.abc import Traversable
except ImportError:
    from importlib.abc import Traversable

[mvanhorn]

Implemented in #1540.