Maint: cli package interface rework

- return concrete struct type
- split interface is sub-interfaces

internal/cli/ci.go

@@ -2,6 +2,6 @@ package cli
 
 import "context"
 
-func (c *cli) CI(context context.Context) error {
+func (c *CLI) CI(context context.Context) error {
 	return nil
 }