feat: add networking module with TCP Socket/Server and example applications

Implement a full-featured `net` module supporting TCP `Socket` and `Server` classes via libuv, including example applications (chat server, echo server, HTTP client/server, file explorer, system dashboard) and benchmark scripts (fibonacci, n-body). Add GEMINI.md project documentation and Stderr class to io module.

example/task_worker.wren

@@ -0,0 +1,51 @@
+// retoor <retoor@molodetz.nl>
+import "scheduler" for Scheduler
+import "timer" for Timer
+
+class TaskQueue {
+  construct new() {
+    _tasks = []
+    _running = true
+  }
+
+  add(name, duration) {
+    System.print("[Queue] Adding task: \%(name) (\%(duration)ms)")
+    _tasks.add({
+      System.print("[Worker] Starting \%(name)...")
+      Timer.sleep(duration)
+      System.print("[Worker] Finished \%(name).")
+    })
+  }
+
+  start() {
+    System.print("[Queue] Starting task runner...")
+    Fiber.new {
+      while (_running) {
+        if (!_tasks.isEmpty) {
+          var task = _tasks.removeAt(0)
+          task.call()
+        }
+        Timer.sleep(100) // Yield to other fibers
+      }
+    }.call()
+  }
+
+  stop() { _running = false }
+}
+
+var queue = TaskQueue.new()
+
+// Start the worker in the background
+queue.start()
+
+// Add some tasks from the main thread
+queue.add("Task A", 1500)
+queue.add("Task B", 500)
+queue.add("Task C", 1000)
+
+System.print("[Main] All tasks queued. Main fiber is free.")
+
+// Keep the main loop alive for a bit to see the output
+Timer.sleep(4000)
+queue.stop()
+System.print("[Main] Shutdown.")