test(e2e): print MCP Docker proof logs

test/scripts/docker-e2e-observability.test.ts

@@ -0,0 +1,17 @@
+import { readFileSync } from "node:fs";
+import { describe, expect, it } from "vitest";
+
+describe("Docker E2E observability", () => {
+  it.each(["scripts/e2e/mcp-channels-docker.sh", "scripts/e2e/cron-mcp-cleanup-docker.sh"])(
+    "prints successful MCP client proof logs from %s",
+    (scriptPath) => {
+      const script = readFileSync(scriptPath, "utf8");
+      const successTail = script.slice(script.lastIndexOf('if [ "$status" -ne 0 ]; then'));
+
+      expect(successTail).toContain('cat "$CLIENT_LOG"');
+      expect(successTail.indexOf('cat "$CLIENT_LOG"')).toBeLessThan(
+        successTail.indexOf('echo "OK"'),
+      );
+    },
+  );
+});