Project Structure

JCM development happens on the Fabric modloader. Everything from source code modification and assets to testing in development environement should happen there.
Forge/other modloaders are only for compiling, and contains modloader-specific code.

The mod's code are located in fabric/src/main/java/com/lx862/jcm/mod, these files will be compiled by all modloaders. (If you have experience with Architectury, this is technically the common module)

The assets are located in fabric/src/main/resources/assets/jsblock, these files are also used by both fabric and forge. Anything other than that is mod-loader specific.

Because the main mod's code are located in the fabric module, you need to run forge:setupFiles in gradle to copy the source code from Fabric to Forge. This is done automatically when using GitHub action to compile.