fixes #186 remove gradle build

[stevehu]

No description provided.

[Copilot]

Copilot review overview

🟢 Approval recommended

Gradle artifacts and callers are removed, while the Maven native-build replacement has focused packaging and failure coverage.

Review effort: Balanced
Findings: None

What changed in this PR

Removes the obsolete Gradle build path identified in #186 and standardizes native packaging on Maven and Docker.

Changes:

• Removes Gradle configuration, wrappers, scripts, and Eclipse integration.
• Modernizes native-image packaging and bootstrap portability.
• Documents and tests native build and failure handling.

File	Description
tests/​test_native_image_script.py	Adds native packaging regression tests.
README.md	Documents Maven and native builds.
native-image-linux.sh	Reworks Maven-driven native packaging.
Makefile	Removes the Gradle build target.
gradlew.bat	Removes the Windows Gradle wrapper.
gradlew	Removes the Unix Gradle wrapper.
gradle/​wrapper/​gradle-wrapper.properties	Removes Gradle wrapper configuration.
gradle.properties	Removes obsolete Gradle dependencies.
build.gradle	Removes the Gradle build definition.
build_graalvm.sh	Removes the Gradle-specific native builder.
bootstrap	Makes the launcher POSIX-compatible.
.project	Removes Eclipse Gradle integration.

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[DiogoFKT]

Looks good