The writer behind the assignments and declared-config mirrors (hq issue 652, ADR 0289, design 54 §2-3): filled from the bucket on its first pass, it compares each value byte for byte, writes by compare-and-set, purges a key whose record is gone with a marker that lives a day, and says each write once after it succeeded. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>