v0.2.0: Text renderable with word-wrap and inline spans

- Text class with content, fg/bg, wrap-mode (:word or :none)
- Span class for inline styled segments (bold, italic, etc.)
- render-text dispatches through backend's draw-text
- word-wrap function splits text at word boundaries
- split-string utility for whitespace tokenization
- 9 new tests: creation, content, empty, truncation, word-wrap,
  single-word, span creation, span storage
- modern-backend now accepts :output-stream
- ASDF updated with text component
- 28 total component tests, 100% GREEN

src/components/package.lisp

@@ -1,9 +1,21 @@
 (defpackage :cl-tui.box
   (:use :cl :cl-tui.backend :cl-tui.layout)
   (:export
+   ;; Box
    #:box #:make-box
    #:box-layout-node
    #:box-border-style #:box-title #:box-title-align
    #:box-fg #:box-bg
-   #:render-box))
+   #:render-box
+   ;; Span
+   #:span
+   #:span-text #:span-bold #:span-italic #:span-underline
+   #:span-reverse #:span-dim #:span-fg #:span-bg
+   ;; Text
+   #:text #:make-text
+   #:text-layout-node #:text-content #:text-spans
+   #:text-fg #:text-bg #:text-wrap-mode
+   #:render-text
+   ;; Utilities (for tests)
+   #:word-wrap #:split-string))
 (in-package :cl-tui.box)