shardsOf

Cut entries into the environment shard plus one shard per user-space jar.

The environment shard is inserted where its first member sat, which in practice is the front — ReplBridge prepends mc-symbols. That does move the rest of the environment ahead of any mod it used to trail, but on Forge those all come out of Configuration.modules(), an unordered Set, so there was no order to preserve; elsewhere it only lifts our own jar-in-jar, whose runtime copy is the one identity anyway.