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/DialogHacking.txt

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+How do providers, categories, feeds and entries correlate?
+And authors on top of that?
+
+Authors are simple: each entry is linked to one author, even if the
+author is the same the objects differ. We can change this in the future,
+right now there is no need to do that.
+The other objects are a bit more difficult.
+
+DXS: provider -> category -> feed/list -> entries
+GHNS: provider -> feed [with categories] -> entries
+
+Example
+-------
+
+The maintainer of an application offers extensions in the categories
+"image" and "script". Since the application has a lot of users, both
+kde-coolextensions.org and kde-betterextensions.org offer such extensions.
+The provider.xml file would thus contain the two <provider>s. When fetching
+the feed files for most popular/most downloaded/most recent, those files
+need to contain entries of *all* categories! A workaround is to add virtual
+providers for each category (there won't be much difference in the UI), but
+ideally with frameworks such as Hotstuff the right number of items will be
+inserted into the feed.
+With DXS, the problem doesn't exist since DXS fetches all categories first
+and then the feeds for each category. DXS also allows to retrieve all entries
+of a certain category, so it is much more flexible in general.
+
+GHNS setup:
+-----------
+ provider kde-coolextensions.org
+  feed most-recent
+   entry a [category image]
+   entry b [category script]
+   ...
+  feed most-downloaded
+  ...
+ provider kde-betterextensions.org
+  ...
+
+Alternative GHNS setup:
+-----------------------
+ provider kde-coolextensions.org/image
+  feed most-recent
+   entry a [image]
+   entry c [image]
+   ..
+  ..
+ provider kde-coolextensions.org/script
+  ...
+
+DXS setup:
+----------
+ provider kde-coolextensions.org
+  category image
+   feed most-recent
+    entry a [image]
+    entry c [image]
+    ...
+   ...
+  ...
+ provider kde-betterextensions.org
+  ...
+