Shared maintenance tools

Do not edit copied scripts independently. Their tests run in the canonical repositories, not in every consumer CI matrix.

Zenodo, release and materialization helpers: moleditpy-common-tools, version 1.0.0. common-tools.lock.json records the tested commit and LF-normalized SHA-256 for each copied script. Repository-specific JSON configuration stays beside these copies. Update from a tested checkout using python tools/sync_consumers.py --repo moleditpy-plugins --write.