refactor(java): share runtime core for concore and concoredocker

[avinxshKD]

Moved the duplicated Java runtime logic into one shared core and kept concore/concoredocker as thin wrappers with the same public API, then added local-wrapper parity test coverage in CI.

Did this because the old setup kept making us patch the same behavior in multiple files and drift was getting expensive.

closes #542

[avinxshKD]

@pradeeban Pls take a look,. Java support is in a much better place now, so this just cleans up duplicated runtime paths and should make future fixes cheaper and safer.

If you want anything adjusted, I can update it quickly :p

[avinxshKD]

Took a bit longer than expected, but the runtime path is cleaner now and behavior is still aligned with existing wrappers/tests.

[pradeeban]

@avinxshKD is our new CJO (Chief Java Officer). :)

[GREENRAT-K405]

Great work @avinxshKD :D let's keep contributing like this and helping each other out!

[pradeeban]

The way we go with CONTROL-CORE multi-language support is funny. Where do we end? Now, Java and Julia. Maybe next is Erlang, Rust, Cairo, and Mojo? :D

[avinxshKD]

The way we go with CONTROL-CORE multi-language support is funny. Where do we end? Now, Java and Julia. Maybe next is Erlang, Rust, Cairo, and Mojo? :D

Haha fair enough, seems like CONTROL-CORE is slowly becoming a multilingual runtime museum :)