novelty atoms reader accepts an atoms file with status: partial and no partial block #642

load_atoms_record (dokimi/dokimi/novelty/atoms.py:787) refuses a partial atoms file only when the partial key is present. A file with "status": "partial" and no partial block is read as a finished atom set. Repro: write {"schema_version": "novelty-atoms.v1", "status": "partial"} and call load_atoms_record(path): it returns ([], [], {...}) instead of raising InputError. Fix: also refuse data.get("status") == "partial", as load_artifact does for novelty.json since #633.

Follow-up from the review of #633: #633 (comment)