WIP: stage all uncommitted work — sprints 46-221, graduation headers, specialist fleet, test steps 909-1988

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

examples/priority_queue/PriorityQueue.h

@@ -0,0 +1,36 @@
+#pragma once
+#include <queue>
+#include <stdexcept>
+#include <vector>
+#include "WorkItem.h"
+
+struct WorkItemComparator {
+    bool operator()(const WorkItem& a, const WorkItem& b) const {
+        return a.priority < b.priority; // max-heap: higher priority first
+    }
+};
+
+class PriorityQueue {
+public:
+    void enqueue(WorkItem item) {
+        heap_.push(std::move(item));
+    }
+
+    WorkItem dequeue() {
+        if (heap_.empty()) throw std::underflow_error("queue is empty");
+        WorkItem top = heap_.top();
+        heap_.pop();
+        return top;
+    }
+
+    const WorkItem& peek() const {
+        if (heap_.empty()) throw std::underflow_error("queue is empty");
+        return heap_.top();
+    }
+
+    std::size_t size() const { return heap_.size(); }
+    bool empty() const { return heap_.empty(); }
+
+private:
+    std::priority_queue<WorkItem, std::vector<WorkItem>, WorkItemComparator> heap_;
+};