fix(FN-7335): keep fast completion summaries

.changeset/fast-completion-summary.md

@@ -0,0 +1,7 @@
+---
+"@runfusion/fusion": patch
+---
+
+summary: Keep workflow completion summaries running for fast-mode tasks.
+category: fix
+dev: Excludes completion-summary/summaryTarget task nodes from the fast-mode custom review/gate skip path.

packages/engine/src/__tests__/executor-fast-mode-workflows.test.ts

@@ -377,6 +377,24 @@ describe("fast mode workflow/runtime invariants", () => {
     expect(executeScript).not.toHaveBeenCalled();
   });
 
+  it.each([
+    ["completion-summary id", { id: "completion-summary", kind: "prompt", config: { prompt: "summarize" } }],
+    ["summaryTarget task", { id: "custom-summary", kind: "prompt", config: { prompt: "summarize", summaryTarget: "task" } }],
+  ])("does not skip completion summary nodes in fast mode by %s", async (_label, node) => {
+    const { executor } = makeExecutorForTask(task({ executionMode: "fast", worktree: "/tmp/wt" }));
+    const executeStep = vi.spyOn(executor as any, "executeWorkflowStep").mockResolvedValue({ success: true, output: "Done." });
+
+    const result = await (executor as any).runGraphCustomNode(
+      node,
+      task({ executionMode: "fast" }),
+      {},
+      undefined,
+    );
+
+    expect(result).toMatchObject({ outcome: "success", value: "passed" });
+    expect(executeStep).toHaveBeenCalledTimes(1);
+  });
+
   it.each(["prompt", "script", "gate"])("executes optional-group template %s nodes in fast mode", async (kind) => {
     const { executor } = makeExecutorForTask(task({ executionMode: "fast", worktree: "/tmp/wt" }));
     const executeStep = vi.spyOn(executor as any, "executeWorkflowStep").mockResolvedValue({ success: true });

packages/engine/src/executor.ts

@@ -7058,7 +7058,12 @@ export class TaskExecutor {
     FNXC:FastOptionalSteps 2026-06-30-09:14:
     Fast skips top-level custom prompt/script/gate review bodies by default, but an enabled optional-group template is explicit operator intent. The graph marks those template nodes so Browser Verification and custom optional groups still run under fast mode.
     */
-    if (live.executionMode === "fast" && !optionalGroupId && !cfg.seam && (node.kind === "prompt" || node.kind === "script" || node.kind === "gate")) {
+    const isCompletionSummaryNode = cfg.summaryTarget === "task" || node.id === "completion-summary";
+    /*
+    FNXC:WorkflowCompletion 2026-07-01-18:42:
+    Fast mode skips review/validation work, not the agent-authored completion summary. FN-7335 reached review with "Fast mode — custom graph node 'completion-summary' skipped"; keep summary nodes executable so fast tasks still produce the same review/done card summary as standard tasks.
+    */
+    if (live.executionMode === "fast" && !isCompletionSummaryNode && !optionalGroupId && !cfg.seam && (node.kind === "prompt" || node.kind === "script" || node.kind === "gate")) {
       executorLog.log(`${live.id}: fast mode — skipping custom graph node '${node.id}'`);
       await this.store.logEntry(
         live.id,