Operator 2026-06-17. The nightly-sweep timer fires green but is a no-op: only
custom-html is WARM_CANONICAL and zero canonical.json records exist -> no
canonical has ever been promoted end-to-end. canon makes it real + proven:
fix/prove the promote path, broaden enrollment, add upstream mirror-sync +
skip-when-unchanged, verify end-to-end (incl. run-twice no-op). Schedule is
incidental; correctness is the deliverable. Replaces the hollow sweep. opus.
