Issue basics — the CRUD floor

Everyday issue operations over the Forge kernel. Every command here is a real forge issue verb (confirm with forge issue --help). The kernel is the single source of truth — never hand-edit the issue store.

Every --json reply is the same envelope: { ok, schema_version, command, data, next_commands } on success, or { ok:false, error:{ message, exit_code } } on failure. Gate on ok — do not parse data until you confirm ok:true.