fix: task subagent static race main (#843)

src/cli/helpers/subagentTurnStart.ts

@@ -0,0 +1,27 @@
+import type { Buffers } from "./accumulator.js";
+
+/**
+ * Completed subagents should only be cleared on true new turns.
+ * During allowReentry (post-approval continuation), completed subagents
+ * must remain available so deferred Task grouping can still resolve.
+ */
+export function shouldClearCompletedSubagentsOnTurnStart(
+  allowReentry: boolean,
+  hasActiveSubagents: boolean,
+): boolean {
+  return !allowReentry && !hasActiveSubagents;
+}
+
+/**
+ * Flush static-eligible lines before reentry so Task grouping is not delayed
+ * by deferred non-Task tool commits.
+ */
+export function flushEligibleLinesBeforeReentry(
+  commitEligibleLines: (
+    b: Buffers,
+    opts?: { deferToolCalls?: boolean },
+  ) => void,
+  buffers: Buffers,
+): void {
+  commitEligibleLines(buffers, { deferToolCalls: false });
+}