Coverage scan updates the single coverage report (#5875), never files a ticket per function #5877

Operator ruling 2026-10-21 15:37Z (cop-state.md, verbatim): 'the coverage scan updates that one report; it never files a ticket per function.' Owner: w5382, after #5874. Done when: the scan that produced the 154 'test: cover ' tickets updates the checklist in #5875 instead of opening issues, and a guard fails if it files one. Refs #5875.