feat(FN-3202): handle manual PR linking and feedback follow-ups

- Add scheduler logic to create dependency-linked follow-up tasks when actionable PR feedback remains after a PR is merged or closed
- Update engine runtime/project wiring to support manual PR create flows and branch publish behavior for fusion/<task-id>
- Add dashboard route coverage for manual PR creation/linking behavior and corresponding engine/runtime tests
- Document manual PR branch conventions and follow-up behavior in task management and dashboard docs

Fusion-Task-Id: FN-3202

packages/engine/src/scheduler.ts

@@ -424,6 +424,32 @@ export class Scheduler {
     return this.options.missionAutopilot;
   }
 
+  configurePrMonitoring(options: {
+    prMonitor?: PrMonitor;
+    onClosedPrFeedback?: SchedulerOptions["onClosedPrFeedback"];
+  }): void {
+    this.options.prMonitor = options.prMonitor;
+    this.options.onClosedPrFeedback = options.onClosedPrFeedback;
+
+    if (!options.prMonitor) {
+      return;
+    }
+
+    void this.store.listTasks({ slim: true, includeArchived: false })
+      .then((tasks) => {
+        const repo = getCurrentRepo(this.store.getRootDir());
+        if (!repo) return;
+
+        for (const task of tasks) {
+          if (task.column !== "in-review" || !task.prInfo) continue;
+          options.prMonitor!.startMonitoring(task.id, repo.owner, repo.repo, task.prInfo);
+        }
+      })
+      .catch((err) => {
+        schedulerLog.error("Failed to hydrate PR monitoring from existing in-review tasks:", err);
+      });
+  }
+
   /**
    * Resolve the base branch for a task being started.
    *