chore(deploy): include UTC-safe checks for active canvas tasks

scripts/zcode-agent/active-run-deploy-check.sql

@@ -0,0 +1,11 @@
+-- Application timestamps are UTC stored without time zone. Compare them to an
+-- explicit UTC clock; an implicit cast uses the database session's time zone
+-- and can incorrectly report active tasks as eight hours old.
+SELECT json_build_object(
+  'images', (SELECT count(*) FROM "CanvasImageTask"
+    WHERE status IN ('pending', 'running')
+      AND "updatedAt" > timezone('UTC', clock_timestamp()) - interval '90 minutes'),
+  'agents', (SELECT count(*) FROM "CanvasAgentRun"
+    WHERE status = 'running'
+      AND "updatedAt" > timezone('UTC', clock_timestamp()) - interval '2 minutes')
+);