feat(FN-4885): complete Step 6 — add deadlock disposition dashboard copy

Fusion-Task-Id: FN-4885
Fusion-Task-Lineage: 31110eed-5ca3-4d67-8f11-581185056dc6

packages/dashboard/app/utils/__tests__/inReviewStallCopy.test.ts

@@ -1,6 +1,6 @@
 import { describe, expect, it } from "vitest";
 
-import { getInReviewStallCopy, shouldShowInReviewStallBadge } from "../inReviewStallCopy";
+import { getInReviewStallCopy, getInReviewStallDeadlockCopy, shouldShowInReviewStallBadge } from "../inReviewStallCopy";
 
 describe("inReviewStallCopy", () => {
   it.each([
@@ -121,4 +121,16 @@ describe("inReviewStallCopy", () => {
     expect(copy.suggestedAction).toBe("Open the activity log for details.");
     expect(copy.badgeLabel).toBe("In-review stall");
   });
+
+  it("returns deadlock disposition copy when paused reason indicates auto-dispose", () => {
+    const copy = getInReviewStallDeadlockCopy({
+      pausedReason: "in-review-stall-deadlock",
+      log: [],
+    } as any);
+
+    expect(copy).toMatchObject({
+      headline: "In-review deadlock auto-disposed",
+    });
+    expect(copy?.nextAction).toContain("unpause");
+  });
 });

packages/dashboard/app/utils/inReviewStallCopy.ts

@@ -1,4 +1,4 @@
-import type { InReviewStallCode, InReviewStallSignal, Task } from "@fusion/core";
+import { IN_REVIEW_STALL_DEADLOCK_LOG_PREFIX, type InReviewStallCode, type InReviewStallSignal, type Task } from "@fusion/core";
 
 import { MAX_AUTO_MERGE_RETRIES } from "../hooks/useBlockerFanout";
 
@@ -11,6 +11,12 @@ export interface InReviewStallCopy {
   code: InReviewStallCode;
 }
 
+export interface InReviewStallDeadlockCopy {
+  headline: string;
+  description: string;
+  nextAction: string;
+}
+
 const BADGE_LABEL_BY_CODE: Record<InReviewStallCode, string> = {
   "merge-blocker": "Merge blocked",
   "transient-merge-status-no-owner": "Merge stalled",
@@ -85,6 +91,23 @@ export function getInReviewStallCopy(
 
 const ACTIVE_MERGE_STATUSES: ReadonlySet<Task["status"]> = new Set(["merging", "merging-pr", "merging-fix"]);
 
+const IN_REVIEW_STALL_DEADLOCK_COPY: InReviewStallDeadlockCopy = {
+  headline: "In-review deadlock auto-disposed",
+  description:
+    "Self-healing paused this in-review task after the same stall repeated without progress. This prevents infinite merge-blocker churn.",
+  nextAction:
+    "Inspect the merge blocker/branch conflict, recover manually, then unpause to retry. If recovery needs extra implementation, create a follow-up with fn_task_refine.",
+};
+
+export function getInReviewStallDeadlockCopy(task: Pick<Task, "pausedReason" | "log">): InReviewStallDeadlockCopy | undefined {
+  if (task.pausedReason === "in-review-stall-deadlock") {
+    return IN_REVIEW_STALL_DEADLOCK_COPY;
+  }
+
+  const hasDeadlockLog = task.log?.some((entry) => entry.action.startsWith(IN_REVIEW_STALL_DEADLOCK_LOG_PREFIX)) ?? false;
+  return hasDeadlockLog ? IN_REVIEW_STALL_DEADLOCK_COPY : undefined;
+}
+
 export function shouldShowInReviewStallBadge(task: Pick<Task, "column" | "paused" | "inReviewStall" | "status">): boolean {
   if (task.column !== "in-review" || task.paused === true || task.inReviewStall == null) {
     return false;