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/docs/Classes.txt

@@ -0,0 +1,21 @@
+Utility classes, useful also outside of KNewStuff2:
+ KTranslatable
+ Security
+
+Container classes:
+ Author
+ Entry
+ Provider
+ Category
+ Feed
+ Installation
+
+Parser/dumper classes:
+ EntryHandler
+ ProviderHandler
+
+Engine classes (asynchronous, therefore qobjects):
+ EntryLoader
+ ProviderLoader
+ CoreEngine
+