[Baylem]

Closes #65. Requires the Gameplane config-field contract tracked in GameplanePanel/Gameplane#938.

Minecraft Java 2.12.0 keeps the independent 75% heap defaults and adds JVM_OPTS, JVM_XX_OPTS and the image's Aikar switch. All five settings apply at the next container start once a server adopts the template. The module README covers the possible initial restart, the 4Gi/2G case and the new settings.

Release order

Ship the supporting Gameplane CRD and operator first. The manifest sets 0.4.1 as the minimum compatible release. If support first ships in a later release, set that version here before publishing. After merging this change, update the Gameplane modules submodule to the merged commit and publish the signed 2.12.0 bundle through the module release workflow. Existing installations can retain 2.11.0 until ready to adopt.

Verification

• python test-minecraft-jvm.py ran the pinned Java 21 image's launcher in three disposable containers. Its final argument lists included the independently sized default heaps, percentage modes, custom options and the native preset only when enabled.
• gp-module validate minecraft-java and the module locale check passed.
• python validate.py minecraft-java found no errors. It reported the existing /data working-directory and HOME advisories for the four pinned images.

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[Baylem]

Reviewed the 2.12.0 catalog fields, version gate, and upgrade instructions against the pinned Java 21 launcher. The image tests exercised separately resolved initial and maximum heap, mixed percentage and fixed sizes, both option variables, and the native Aikar preset. Catalog validation and the devcontainer checks passed.

Release the compatible Gameplane CRDs and operator before publishing this catalog version. Confirm that the minimum version identifies a release containing deferred environment support.