feat: Cli.New(c) constructor — Core uses it during construction

Cli{}.New(c) replaces &Cli{core: c} in contract.go.
9 tests passing.

Co-Authored-By: Virgil <virgil@lethean.io>

cli.go

@@ -20,6 +20,13 @@ type Cli struct {
 	banner func(*Cli) string
 }
 
+// New creates a Cli bound to a Core instance.
+//
+//	cli := core.Cli{}.New(c)
+func (cl Cli) New(c *Core) *Cli {
+	return &Cli{core: c, output: os.Stdout}
+}
+
 // Print writes to the CLI output (defaults to os.Stdout).
 //
 //	c.Cli().Print("hello %s", "world")

contract.go

@@ -104,7 +104,7 @@ func New(opts ...CoreOption) Result {
 		commands: &commandRegistry{commands: make(map[string]*Command)},
 	}
 	c.context, c.cancel = context.WithCancel(context.Background())
-	c.cli = &Cli{core: c}
+	c.cli = Cli{}.New(c)
 
 	for _, opt := range opts {
 		if r := opt(c); !r.OK {