Initialize governed Dataflow module

webui/scripts/test-dataflow-page-structure.mjs

@@ -0,0 +1,25 @@
+import { readFileSync } from "node:fs";
+
+const page = readFileSync(new URL("../src/features/dataflow/DataflowPage.tsx", import.meta.url), "utf8");
+const canvas = readFileSync(new URL("../src/features/dataflow/DataflowCanvas.tsx", import.meta.url), "utf8");
+const css = readFileSync(new URL("../src/styles/dataflow.css", import.meta.url), "utf8");
+
+const checks = [
+  [page.includes("<DataflowCanvas"), "graph canvas"],
+  [page.includes("Apply SQL"), "SQL workbench"],
+  [page.includes("<NodeInspector"), "node inspector"],
+  [page.includes("previewDataflowPipeline"), "preview action"],
+  [page.includes("useUnsavedDraftGuard"), "unsaved-change guard"],
+  [canvas.includes("application/x-govoplan-dataflow-node"), "palette drop handling"],
+  [canvas.includes("isValidConnection"), "edge validation"],
+  [canvas.includes("connectionRadius={32}"), "visible connection drop radius"],
+  [css.includes("height: calc(100vh - 115px)"), "full-height workspace"],
+  [css.includes(".dataflow-preview-table-wrap"), "bounded preview scrolling"]
+];
+
+const missing = checks.filter(([present]) => !present).map(([, label]) => label);
+if (missing.length) {
+  throw new Error(`Dataflow UI structure is missing: ${missing.join(", ")}`);
+}
+
+console.log("Dataflow page structure checks passed.");