Revert "Migrate code generation from string-based to JavaPoet (#2)"

This reverts commit 4cbe4ad.

Author: wassertim

docs/JAVAPOET_MIGRATION.md

@@ -23,7 +23,6 @@
         <!-- Dependency versions -->
         <aws.sdk.version>2.29.39</aws.sdk.version>
         <jakarta.enterprise.version>4.1.0</jakarta.enterprise.version>
-        <javapoet.version>0.7.0</javapoet.version>
         <junit.version>5.11.4</junit.version>
         <assertj.version>3.26.3</assertj.version>
     </properties>
@@ -51,13 +50,6 @@
             <optional>true</optional>
         </dependency>
 
-        <!-- Code generation -->
-        <dependency>
-            <groupId>com.palantir.javapoet</groupId>
-            <artifactId>javapoet</artifactId>
-            <version>${javapoet.version}</version>
-        </dependency>
-
         <!-- Test dependencies -->
         <dependency>
             <groupId>org.junit.jupiter</groupId>