Rename json-java21-transforms to json-java21-jdt (JSON Document Transforms)

- Rename module from json-java21-transforms to json-java21-jdt
- New package: json.java21.jdt with Jdt engine and JdtException
- Implement core JDT operations: replace, remove, rename, merge
- Execution order: Rename → Remove → Merge → Replace
- 18 unit tests + 15 Microsoft fixture tests (33 total)
- Path-based operations deferred to Skipped/ folders for future work

To verify: mvn test -pl json-java21-jdt

Author: simbo1905

json-java21-jdt/pom.xml

@@ -0,0 +1,93 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 
+         http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+
+    <parent>
+        <groupId>io.github.simbo1905.json</groupId>
+        <artifactId>parent</artifactId>
+        <version>0.1.9</version>
+    </parent>
+
+    <artifactId>java.util.json.jdt</artifactId>
+    <packaging>jar</packaging>
+    <name>java.util.json Java21 Backport JDT</name>
+    <url>https://simbo1905.github.io/java.util.json.Java21/</url>
+    <scm>
+        <connection>scm:git:https://github.com/simbo1905/java.util.json.Java21.git</connection>
+        <developerConnection>scm:git:git@github.com:simbo1905/java.util.json.Java21.git</developerConnection>
+        <url>https://github.com/simbo1905/java.util.json.Java21</url>
+        <tag>HEAD</tag>
+    </scm>
+    <description>JSON Document Transforms (JDT) implementation for the java.util.json Java 21 backport; transforms JSON documents using declarative transform specifications.</description>
+
+    <properties>
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+        <maven.compiler.release>21</maven.compiler.release>
+    </properties>
+
+    <dependencies>
+        <dependency>
+            <groupId>io.github.simbo1905.json</groupId>
+            <artifactId>java.util.json</artifactId>
+            <version>${project.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>io.github.simbo1905.json</groupId>
+            <artifactId>java.util.json.jsonpath</artifactId>
+            <version>${project.version}</version>
+        </dependency>
+
+        <!-- Test dependencies -->
+        <dependency>
+            <groupId>org.junit.jupiter</groupId>
+            <artifactId>junit-jupiter-api</artifactId>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.junit.jupiter</groupId>
+            <artifactId>junit-jupiter-engine</artifactId>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.junit.jupiter</groupId>
+            <artifactId>junit-jupiter-params</artifactId>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.assertj</groupId>
+            <artifactId>assertj-core</artifactId>
+            <scope>test</scope>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <plugins>
+            <!-- Treat all warnings as errors, enable all lint warnings -->
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <configuration>
+                    <release>21</release>
+                    <compilerArgs>
+                        <arg>-Xlint:all</arg>
+                        <arg>-Werror</arg>
+                        <arg>-Xdiags:verbose</arg>
+                    </compilerArgs>
+                </configuration>
+            </plugin>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-surefire-plugin</artifactId>
+                <configuration>
+                    <argLine>-ea</argLine>
+                    <systemPropertyVariables>
+                        <jdt.test.resources>${project.basedir}/src/test/resources</jdt.test.resources>
+                    </systemPropertyVariables>
+                </configuration>
+            </plugin>
+        </plugins>
+    </build>
+</project>