feat: simplify SOP to immediate-effect configuration

migrations/000009_run_knowledge_snapshot.up.sql

@@ -0,0 +1,3 @@
+ALTER TABLE sop_runs ADD COLUMN knowledge_snapshot JSON NULL AFTER outputs;
+UPDATE sop_runs SET knowledge_snapshot = JSON_OBJECT('items', JSON_ARRAY(), 'relations', JSON_ARRAY());
+ALTER TABLE sop_runs MODIFY knowledge_snapshot JSON NOT NULL;