feat: add @Tag reporting and CSV/plain output

- Default CSV output with header; -plain enables labeled text format
- Extract repeated @Tag and @Tags container values
- Configure JavaParser language level for modern syntax (records)
- Add fixture-based JUnit tests and README usage/examples

src/test/resources/fixtures/AnotherTest.java.txt

@@ -0,0 +1,10 @@
+package com.acme.other;
+
+import org.junit.jupiter.api.RepeatedTest;
+
+public class AnotherTest {
+
+    @RepeatedTest(2)
+    void delta() {
+    }
+}

src/test/resources/fixtures/SampleOneTest.java.txt

@@ -0,0 +1,31 @@
+package com.acme.tests;
+
+import org.junit.jupiter.api.Tag;
+import org.junit.jupiter.api.Tags;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.ValueSource;
+
+public class SampleOneTest {
+
+    @Test
+    @Tag("fast")
+    @Tag("crypto")
+    void alpha() {
+        int a = 1;
+        int b = 2;
+        int c = a + b;
+    }
+
+    @ParameterizedTest
+    @ValueSource(ints = { 1, 2 })
+    @Tag("param")
+    void beta(int x) {
+        // single line
+    }
+
+    @Test
+    @Tags({ @Tag("nested1"), @Tag("nested2") })
+    void gamma() {
+    }
+}