feat(k-ui): first slice: App trait + run loop, builders (column/row/text/button), flex layout, theme tokens (Whimsy Dark), tiny-skia + fontdue render (Noto Sans Latin subset), keyboard focus ring; tally demo; manifest memory key (pm spawns with it)

crates/apps/tally/manifest.toml

@@ -0,0 +1,10 @@
+[app]
+id      = "kos.tally"
+name    = "Tally"
+version = "1.0.0"
+binary  = "tally"
+author  = "K-OS"
+memory  = "3 MiB"
+
+[capabilities]
+required = ["display"]