[Y-Nak]

Solcore and Solidity share the .sol extension, so the language server and editor integrations also picked up Solidity files. Every Solcore source file must now begin with pragma solcore;, and the tools use it to recognize Solcore files.

• The compiler reports SC0002 unless a file starts with exactly one pragma solcore; without arguments (comments may precede it).
• All sources, examples, fixtures and tests declare the pragma, and new playground files start with it.
• The native language server indexes only .sol files with the pragma, and auto-imports go after it.
• VS Code, Vim and Emacs open only these files as Solcore and leave other .sol files to Solidity support.