feat: add uptime runner agent

mod.ts

@@ -0,0 +1,24 @@
+#!/usr/bin/env -S deno run --allow-all
+
+/**
+ * uptime.link runner agent.
+ *
+ * The runner connects to an uptime.link instance, fetches assigned check jobs,
+ * executes them from the local network location, and reports results back.
+ */
+
+import { UptimeRunnerCli } from './ts/cli.ts';
+
+async function main(): Promise<void> {
+  const cli = new UptimeRunnerCli();
+  await cli.parseAndExecute(Deno.args);
+}
+
+if (import.meta.main) {
+  try {
+    await main();
+  } catch (error) {
+    console.error(`Error: ${error instanceof Error ? error.message : String(error)}`);
+    Deno.exit(1);
+  }
+}