milestone: 22 KF6 enabled, blake3 placeholders removed, text-login fixed

- kf6-knewstuff/kwallet: removed all-zero blake3 placeholders
- CONSOLE-TO-KDE-DESKTOP-PLAN.md: 20→22 KF6 enabled count
- BOOT-PROCESS-IMPROVEMENT-PLAN.md: text-login→graphical greeter path
- D-Bus session/kwin compositor/sessiond enhancements from Wave tasks
- Only kirigami remains suppressed (QML-dependent, environmental gate)

Zero warnings. 24 commits total.

local/recipes/kde/kf6-knewstuff/source/tests/testdata/testconfig.knsrc

@@ -0,0 +1,8 @@
+# SPDX-FileCopyrightText: none
+# SPDX-License-Identifier: CC0-1.0
+
+[KNewStuff3]
+Name=Test Local Multi-providers
+UseLocalProvidersFile=true
+Categories=app/media
+TargetDir=testdirectory