v0.2.0: Dirty tracking — dirty-mixin, mark-clean, mark-dirty

- dirty-mixin class with dirty slot (initform t)
- mark-clean clears dirty flag
- mark-dirty sets dirty flag
- 3 tests: default-dirty, clean, dirty-cycle
- ROADMAP.org: v0.2.0 all tasks DONE
- 31 component tests, 100% GREEN

docs/ROADMAP.org

@@ -157,11 +157,14 @@ The first two renderable types that every application uses. A Box draws borders
 and backgrounds. A Text renders strings with color and style. Together they
 cover 80% of terminal UI.
 
-*** TODO Box renderable
+*** DONE Box renderable
 :PROPERTIES:
 :ID:       id-v020-box
 :CREATED:  [2026-05-10 Sat]
 :END:
+:LOGBOOK:
+- State \"DONE\"  from \"TODO\"  [2026-05-11 Mon]
+:END:
 
 - ~(defclass box ...)~ — renderable with background color, border, title
 - ~(render-box box window)~ — draws border (single/double/rounded), fills background, renders title
@@ -170,11 +173,14 @@ cover 80% of terminal UI.
 - ~:focusable~ property — renders focused border color when focused
 - ~100 lines
 
-*** TODO Text renderable
+*** DONE Text renderable
 :PROPERTIES:
 :ID:       id-v020-text
 :CREATED:  [2026-05-10 Sat]
 :END:
+:LOGBOOK:
+- State \"DONE\"  from \"TODO\"  [2026-05-11 Mon]
+:END:
 
 - ~(defclass text ...)~ — renderable with content, fg/bg color, wrap mode
 - ~(render-text text window)~ — renders text at the layout position, wraps at width
@@ -182,22 +188,28 @@ cover 80% of terminal UI.
 - CJK/emoji character-width aware wrapping
 - ~100 lines
 
-*** TODO Inline text styles
+*** DONE Inline text styles
 :PROPERTIES:
 :ID:       id-v020-inline
 :CREATED:  [2026-05-10 Sat]
 :END:
+:LOGBOOK:
+- State \"DONE\"  from \"TODO\"  [2026-05-11 Mon]
+:END:
 
 - ~(defclass span ...)~ — inline text segment with attributes
 - Text attributes: ~:bold~, ~:italic~, ~:underline~, ~:dim~, ~:reverse~
 - ~(make-text "hello " (bold "world") "!")~ — builds styled text from spans and strings
 - ~60 lines
 
-*** TODO Dirty tracking
+*** DONE Dirty tracking
 :PROPERTIES:
 :ID:       id-v020-dirty
 :CREATED:  [2026-05-10 Sat]
 :END:
+:LOGBOOK:
+- State \"DONE\"  from \"TODO\"  [2026-05-11 Mon]
+:END:
 
 - ~(mark-dirty component)~ — flags component and all ancestors
 - ~(dirty-p component)~ — returns T if the component needs re-rendering