diff --git a/internal/fixtures/on-demand-checks.json b/internal/fixtures/on-demand-checks.json
index 5c05654f2..fdadac724 100644
--- a/internal/fixtures/on-demand-checks.json
+++ b/internal/fixtures/on-demand-checks.json
@@ -7,6 +7,7 @@
   "check:composite": "rebuilds every bundle with vite to compare its bytes, minutes long by design; on every landing the precondition's fresh step rebuilds the composites that landing reaches",
   "check:hardcoded-english": "report-only while its findings are triaged (97 user-visible English strings on 2026-09-29); chaining it now would hold every gate red. Its :self-test IS chained, so the matcher stays proven",
   "check:shot-fonts": "checks that the MACHINE taking README screenshots can render emoji (fc-list): a property of that box, not of the product, so it runs before a screenshot session, not in the gates",
-  "check:coverage-consistent": "the full run includes clause L, the age of the oldest link verification (45 days), which depends on the CALENDAR: chained, it would turn gates red on a date (first 2026-11-08) with no code change. Run it with the link re-verification; every other clause runs in gates:pre as check:coverage-consistent:chained"
+  "check:coverage-consistent": "the full run includes clause L, the age of the oldest link verification (45 days), which depends on the CALENDAR: chained, it would turn gates red on a date (first 2026-11-08) with no code change. Run it with the link re-verification; every other clause runs in gates:pre as check:coverage-consistent:chained",
+  "check:region-paint-single-source": "TEMPORARY, remove when chained. Asserts the regions idle paint expression has one source in the library rather than a copy per map. Half-adopted on purpose: research-map.vue took the library export (2026-09-29), countries-map.vue is the other plugin owner's file and its two assertions are red until they land their half. Chaining it now would hold gates:post red for everyone over another agent's unlanded work. It joins gates:post in the SAME landing as that half, and this entry is deleted in that commit"
  }
 }