fix: address concurrency issues and add stress tests

futur-jcstress/build.gradle

@@ -0,0 +1,24 @@
+plugins {
+    id 'java'
+    id 'io.github.reyerizo.gradle.jcstress' version '0.8.15'
+}
+
+group = 'dev.tommyjs'
+version = '2.5.5'
+
+repositories {
+    mavenCentral()
+}
+
+java {
+    sourceCompatibility = JavaVersion.VERSION_21
+    targetCompatibility = JavaVersion.VERSION_21
+}
+
+dependencies {
+    implementation project(':futur-api')
+}
+
+jcstress {
+    jcstressDependency = 'org.openjdk.jcstress:jcstress-core:0.16'
+}