init: readme 작성 하네스 설계

tests/fixtures/existing-readme-backend/.gradle/buildOutputCleanup/cache.properties

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+#Fri Jul 24 13:25:57 KST 2026
+gradle.version=9.2.0

tests/fixtures/existing-readme-backend/README.md

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+# demo
+
+## 빠른 시작
+
+Run `./gradlew doesNotExist` to start, then read [the docs](docs/missing.md).

tests/fixtures/existing-readme-backend/build.gradle.kts

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+plugins {
+    java
+}
+
+tasks.register("test") {
+    description = "Run the tests"
+}

tests/fixtures/valid-backend/.gradle/buildOutputCleanup/cache.properties

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+#Fri Jul 24 13:25:55 KST 2026
+gradle.version=9.2.0

tests/fixtures/valid-backend/build.gradle.kts

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+plugins {
+    java
+}
+
+group = "com.example.demo"
+version = "0.1.0"
+
+tasks.register("bootRun") {
+    description = "Run the application"
+}
+
+tasks.register("test") {
+    description = "Run the tests"
+}

tests/fixtures/valid-backend/settings.gradle.kts

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+rootProject.name = "demo"
+include(":core-domain")

tests/fixtures/valid-backend/src/main/java/App.java

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+public class App {
+    public static void main(String[] args) {
+        System.out.println("demo");
+    }
+}