fix: KF6Attica recipe, kf6-knewstuff Attica dep, topo-sort cycle error

- Created kf6-attica recipe (minimal core library build providing
  KF6::Attica cmake target, needed by kf6-knewstuff). v6.10.0,
  QML/tests/examples disabled.
- Added kf6-attica to redbear-full.toml config, integrate-redbear.sh
  symlink, and recipes/kde/ symlink.
- Fixed kf6-knewstuff: removed stale find_package(KF6Attica)
  suppression; added kf6-attica as dependency. Now publishes
  to repo (core-only build produces empty package — upstream
  code structure yields no libs with QtQuick/widgets/tools off).
- Cookbook topo-sort: changed cycle fallback from silent
  Ok(recipes) to Err(Recursion) — surfaces dependency graph
  bugs instead of hiding them.
- Fixed stale QtNetwork comment: QtNetwork IS enabled in qtbase
  since 2026-04-29 (relibc DNS resolver hardened).
- Verified: kf6-attica builds, kf6-knewstuff publishes to repo

local/recipes/kde/kf6-knewstuff/recipe.toml

@@ -1,9 +1,4 @@
-#TODO: KNewStuff — attempt an honest core-only build on Redox. Qt Quick, widgets, tools, and Kirigami-facing surfaces stay disabled; the remaining hard blockers are the missing KF6Attica package in-tree and the still-disabled QtNetwork surface in qtbase.
-[source]
-tar = "https://invent.kde.org/frameworks/knewstuff/-/archive/v6.10.0/knewstuff-v6.10.0.tar.gz"
-
-[build]
-template = "custom"
+#TODO: KNewStuff — core-only build on Redox. Qt Quick, widgets, tools, and Kirigami-facing surfaces disabled. KF6Attica now available in-tree (kf6-attica recipe).
 dependencies = [
     "qtbase",
     "kf6-extra-cmake-modules",
@@ -12,6 +7,8 @@ dependencies = [
     "kf6-kconfig",
     "kf6-karchive",
     "kf6-kpackage",
+    "kf6-kwidgetsaddons",
+    "kf6-attica",
 ]
 script = """
 DYNAMIC_INIT
@@ -38,6 +35,10 @@ sed -i 's/^add_subdirectory(tools)/# add_subdirectory(tools) # disabled for Redo
     "${COOKBOOK_SOURCE}/src/CMakeLists.txt" 2>/dev/null || true
 sed -i 's/^add_subdirectory(widgets)/# add_subdirectory(widgets) # disabled for Redox core-only build/' \
     "${COOKBOOK_SOURCE}/src/CMakeLists.txt" 2>/dev/null || true
+sed -i 's/^add_subdirectory(tools)/# add_subdirectory(tools) # disabled for Redox core-only build/' \
+    "${COOKBOOK_SOURCE}/src/CMakeLists.txt" 2>/dev/null || true
+sed -i 's/^add_subdirectory(widgets)/# add_subdirectory(widgets) # disabled for Redox core-only build/' \
+    "${COOKBOOK_SOURCE}/src/CMakeLists.txt" 2>/dev/null || true
 
 rm -f CMakeCache.txt
 rm -rf CMakeFiles