printedparts lab: post-stage polish addendum and closing lesson

docs/PLUGIN-LAB-PRINTEDPARTS.md

@@ -413,6 +413,21 @@ First real touchscreen session found two problems worth their own stage:
 
 ---
 
+## Post-stage polish (untagged commits on the branch)
+
+Small refinements that did not warrant stages but complete the picture:
+- The kiosk launches from the sidebar's hardcoded "Displays" section (beside
+  Shopfloor Dashboard / TV Slideshow), plugin-gated and opening a new tab -
+  kiosk-style pages belong there, not in the plugin's Information nav.
+- The touch keypad was restyled into a terminal-style card panel (boxed
+  entry display, fixed 3-column grid, press feedback) after the first
+  hands-on review called the initial version ugly. Looks are requirements
+  on a kiosk.
+
+The overall arc is the lab's closing lesson: the spec carried the build to
+stage 10; every stage after came from deployment and real users. Plugins are
+finished by the floor, not by the spec.
+
 ## Where each pattern lives (cheat sheet)
 
 | Need | Copy from |