feat(FN-4493): complete Step 5 — add seeded workflow prompt updater script

Fusion-Task-Id: FN-4493
Fusion-Task-Lineage: 966c7c55-fd51-4263-9d4e-87e9d06bfb6f

scripts/replace-seeded-workflow-prompts.mjs

@@ -0,0 +1,70 @@
+#!/usr/bin/env node
+/**
+ * Rollback prompts captured before replacement (from local worktree DB):
+ * WS-004: not present in .fusion/fusion.db at capture time.
+ * WS-006: not present in .fusion/fusion.db at capture time.
+ *
+ * To capture production rollback text before applying:
+ * sqlite3 <db> "SELECT id, prompt FROM workflow_steps WHERE id IN ('WS-004','WS-006') ORDER BY id;"
+ */
+import Database from "better-sqlite3";
+import { resolve } from "node:path";
+
+const dbPath = (process.argv.find((arg) => arg.startsWith("--db=")) || "--db=.fusion/fusion.db").slice(5);
+const checkOnly = process.argv.includes("--check");
+
+let WORKFLOW_STEP_TEMPLATES;
+try {
+  ({ WORKFLOW_STEP_TEMPLATES } = await import("../packages/core/dist/types.js"));
+} catch {
+  console.error("Unable to import packages/core/dist/types.js. Run: pnpm --filter @fusion/core build");
+  process.exit(1);
+}
+
+const templateMap = new Map(WORKFLOW_STEP_TEMPLATES.map((entry) => [entry.id, entry.prompt]));
+const seededMappings = [
+  { workflowStepId: "WS-004", templateId: "browser-verification" },
+  { workflowStepId: "WS-006", templateId: "frontend-ux-design" },
+];
+
+const db = new Database(resolve(dbPath));
+const getRow = db.prepare("SELECT id, name, prompt FROM workflow_steps WHERE id = ?");
+const updateRow = db.prepare("UPDATE workflow_steps SET prompt = ?, updatedAt = ? WHERE id = ?");
+
+let updated = 0;
+let skipped = 0;
+let noOp = 0;
+
+for (const { workflowStepId, templateId } of seededMappings) {
+  const nextPrompt = templateMap.get(templateId);
+  if (!nextPrompt) {
+    console.error(`Template ${templateId} not found in WORKFLOW_STEP_TEMPLATES`);
+    process.exit(1);
+  }
+
+  const row = getRow.get(workflowStepId);
+  if (!row) {
+    skipped += 1;
+    console.log(`${workflowStepId}: not present, skipping`);
+    continue;
+  }
+
+  const current = row.prompt ?? "";
+  if (current === nextPrompt) {
+    noOp += 1;
+    console.log(`${workflowStepId}: no-op, already up to date`);
+    continue;
+  }
+
+  if (checkOnly) {
+    updated += 1;
+    console.log(`${workflowStepId}: differs (check-only)`);
+    continue;
+  }
+
+  updateRow.run(nextPrompt, new Date().toISOString(), workflowStepId);
+  updated += 1;
+  console.log(`${workflowStepId}: updated (${row.name})`);
+}
+
+console.log(`Updated ${updated} row(s), skipped ${skipped}, no-op ${noOp}`);