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.md

@@ -0,0 +1,35 @@
+---
+name: run_model
+kind: function
+lang: go
+domain: tui
+version: "1.0.0"
+purity: impure
+signature: "func RunModel[T tea.Model](model T) core.Result[T]"
+description: "Ejecuta un modelo Bubble Tea y devuelve el modelo final o error."
+tags: [tui, runner, bubbletea, generic]
+uses_functions: []
+uses_types: [result_go_core]
+returns: [result_go_core]
+returns_optional: false
+error_type: "error_go_core"
+imports: [github.com/charmbracelet/bubbletea]
+tested: false
+tests: []
+test_file_path: ""
+file_path: "functions/tui/run_model.go"
+---
+
+## Ejemplo
+
+```go
+result := tui.RunModel(myModel)
+if result.IsErr() {
+    log.Fatal(result.Error())
+}
+finalModel := result.Unwrap()
+```
+
+## Notas
+
+Implementacion real en github.com/lucasdataproyects/devfactory/tui. Este stub existe para documentar la firma y mantener el registry.