Key changes:
- Created scripts/lib/safe_yaml_update.py with PROTECTED_KEYS constant
- Fixed enrich_custodians_wikidata_full.py to re-read files before writing
(prevents race conditions where another script modified the file)
- Added safety check to abort if protected keys would be lost
- Protected keys include: location, original_entry, ghcid, provenance,
google_maps_enrichment, osm_enrichment, etc.
Root cause of data loss in 62fdd35321:
- Script loaded files into list, then processed them later
- If another script modified files between load and write, changes were lost
- Now files are re-read immediately before modification
Per AGENTS.md Rule 5: NEVER Delete Enriched Data - Additive Only
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