feat: 29 funciones TUI — constructores, runners y helpers del dominio tui

16 constructores puros (NewList, NewSpinner, NewProgress, DefaultStyles...),
4 runners impuros (RunModel, RunFullscreen, RunWithMouseSupport, Confirm),
5 print helpers impuros (PrintSuccess/Error/Warning/Info/Muted) y
4 utilidades puras (Quit, ClearScreen, HideCursor, ShowCursor).
Stubs que documentan devfactory/tui para el registry.

functions/tui/run_model.go

@@ -0,0 +1,12 @@
+package tui
+
+// Implementation: github.com/lucasdataproyects/devfactory/tui
+
+import "github.com/charmbracelet/bubbletea"
+
+// RunModel ejecuta un modelo Bubble Tea y devuelve el modelo final o error.
+func RunModel[T tea.Model](model T) Result[T] {
+	// stub — implementation in devfactory/tui
+	var zero T
+	return Result[T]{Value: zero}
+}