Add GremlinJar and GremlinBootstrap

[jpenilla]

Simplifies using Gremlin for a standalone application.

• Support nested jars only mode (no runtime downloads)

[Copilot]

Pull Request Overview

This PR adds a standalone Gremlin bootstrap class to extract nested JARs, resolve dependencies, and launch the application, and extends the Gradle plugin with tasks to index and package those nested JARs into a single executable archive.

• Introduce GremlinBootstrap for runtime unpacking, dependency resolution, and custom classloader launch.
• Add IndexNestedJars and GremlinJar tasks to the Gradle plugin, plus a defaultGremlinRuntime configuration.
• Wire new tasks into GremlinPlugin and adjust resource/output wiring for nested JAR packaging.

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 4 comments.

File	Description
runtime/src/main/java/xyz/jpenilla/gremlin/runtime/GremlinBootstrap.java	Implements bootstrap logic to extract nested JARs, read dependencies, and spawn the main thread.
gradle-plugin/src/main/kotlin/xyz/jpenilla/gremlin/gradle/IndexNestedJars.kt	Adds a task to generate index.txt listing nested JAR names.
gradle-plugin/src/main/kotlin/xyz/jpenilla/gremlin/gradle/GremlinPlugin.kt	Registers defaultGremlinRuntime, indexNestedJars, and gremlinJar tasks; wires configurations.
gradle-plugin/src/main/kotlin/xyz/jpenilla/gremlin/gradle/GremlinJar.kt	Defines GremlinJar task to assemble an executable JAR with nested JARs and custom manifest.

[Copilot]

Pull Request Overview

Adds a standalone Gremlin launcher and the accompanying Gradle plugin support for bundling nested JARs.

• Introduces GremlinBootstrap to extract nested JARs, resolve dependencies, and launch the main application from a single JAR.
• Adds Gradle tasks and utilities (PrepareNestedJars, BootstrapJar, and helper extensions) to package Gremlin runtime and nested JARs.
• Updates plugin extension properties for controlling inclusion of the Gremlin runtime on compile/runtime classpaths.

Reviewed Changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
runtime/src/main/java/xyz/jpenilla/gremlin/runtime/GremlinBootstrap.java	New bootstrap class to unpack nested JARs, resolve dependencies, and invoke the target main class.
gradle-plugin/src/main/kotlin/xyz/jpenilla/gremlin/gradle/utils.kt	Added Path and zip-file helper extensions for URI and filesystem operations.
gradle-plugin/src/main/kotlin/xyz/jpenilla/gremlin/gradle/PrepareNestedJars.kt	New Gradle task that copies specified JARs into an output dir and generates an index.
gradle-plugin/src/main/kotlin/xyz/jpenilla/gremlin/gradle/GremlinPlugin.kt	Registers gremlinRuntime & nestedJars configurations and tasks (prepareNestedJars, bootstrapJar), and wires classpath extensions.
gradle-plugin/src/main/kotlin/xyz/jpenilla/gremlin/gradle/GremlinExtension.kt	Replaced old runtime-dependency flag with separate compile/runtime flags and added a nestJars helper.
gradle-plugin/src/main/kotlin/xyz/jpenilla/gremlin/gradle/BootstrapJar.kt	Defines a custom Jar task that unpacks runtime JARs, writes manifest entries, and nests additional JARs.

Comments suppressed due to low confidence (1)

runtime/src/main/java/xyz/jpenilla/gremlin/runtime/GremlinBootstrap.java:51

• [nitpick] There are no unit tests covering GremlinBootstrap. Adding tests for nested-jar extraction, manifest parsing, and main invocation would help prevent regressions.

public static void main(final String[] args) {