fix: deliver validated AI insight responses

migrations/000006_growth_coach_completion_guard.sql

@@ -0,0 +1,19 @@
+BEGIN;
+
+UPDATE golden_steps
+SET status = 'IN_PROGRESS',
+    completed_at = NULL,
+    updated_at = now()
+WHERE action_type = 'METRIC'
+  AND status = 'COMPLETED'
+  AND (
+    current_value IS NULL
+    OR target IS NULL
+    OR metric_direction IS NULL
+    OR (metric_direction = 'INCREASE' AND current_value < target)
+    OR (metric_direction = 'DECREASE' AND current_value > target)
+  );
+
+INSERT INTO schema_migrations(version) VALUES (6);
+
+COMMIT;