feat(FN-3939): audit and patch PR #59 residual defects, add retry parity an

Completes FN-3939 audit work for PR #59 residual defects by refactoring the mission execution loop in the engine (halving its complexity), adding self-healing test coverage, and wiring in task workflow route improvements. Retry and validation behavior updates are documented in the changeset and skil

Fusion-Task-Id: FN-3939

packages/dashboard/src/routes/register-task-workflow-routes.ts

@@ -528,16 +528,35 @@ export function registerTaskWorkflowRoutes(ctx: ApiRoutesContext, deps: TaskWork
         throw badRequest(`Task is not in a retryable state (current status: ${task.status || 'none'})`);
       }
 
-      // In-review retry: keep the task in in-review, clear only error/retry state
-      // so the auto-merge system re-attempts on its next sweep.
+      // In-review retry: distinguish between execution failures (incomplete steps)
+      // and merge failures (all steps done).
       if (isInReviewRetry) {
+        const hasIncompleteSteps =
+          task.steps.length > 0 &&
+          task.steps.some((s: { status: string }) => s.status === "pending" || s.status === "in-progress");
+
+        if (hasIncompleteSteps) {
+          await scopedStore.updateTask(req.params.id, {
+            status: null,
+            error: null,
+            stuckKillCount: 0,
+          });
+          await scopedStore.logEntry(
+            req.params.id,
+            "Retry requested from dashboard (execution failure in-review → todo, preserving progress)",
+          );
+          const updated = await scopedStore.moveTask(req.params.id, "todo", { preserveProgress: true });
+          res.json(updated);
+          return;
+        }
+
         await scopedStore.updateTask(req.params.id, {
           status: null,
           error: null,
           stuckKillCount: 0,
           mergeRetries: 0,
         });
-        await scopedStore.logEntry(req.params.id, "Retry requested from dashboard (in-review retry, mergeRetries reset)");
+        await scopedStore.logEntry(req.params.id, "Retry requested from dashboard (in-review merge retry, mergeRetries reset)");
         const updated = await scopedStore.getTask(req.params.id);
         res.json(updated);
         return;