V0.1.4/almonds core bug 15

[kicka5h]

Summary

• name reference updates from old "snack-stash" to "python-snacks"
• fix snack list return clobber with other .py files

Closes #15

Changes

• updated "snack-stash" to "python-snacks" in 5 files
• limit snack list to stash in main

Test plan

• Existing tests pass (pytest tests/ -v)
• New tests added for any new behaviour
• Tested manually with a real stash

Notes for reviewer