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/system/redbear-sessiond/source/src/session.rs

@@ -60,6 +60,12 @@ impl LoginSession {
             .map(|runtime| runtime.clone())
             .map_err(|_| fdo::Error::Failed(String::from("login1 runtime state is poisoned")))
     }
+
+    fn runtime_write(&self) -> fdo::Result<std::sync::RwLockWriteGuard<'_, crate::runtime_state::SessionRuntime>> {
+        self.runtime
+            .write()
+            .map_err(|_| fdo::Error::Failed(String::from("login1 runtime state is poisoned")))
+    }
 }
 
 #[interface(name = "org.freedesktop.login1.Session")]
@@ -192,13 +198,19 @@ impl LoginSession {
         let session_id = runtime.session_id.clone();
         drop(runtime);
 
-        if let Ok(mut guard) = self.runtime.write() {
-            guard.state = String::from("closing");
-        }
+        self.runtime_write()?.state = String::from("closing");
         eprintln!("redbear-sessiond: Terminate requested for session {session_id}");
         Ok(())
     }
 
+    fn kill(&self, who: &str, signal_number: i32) -> fdo::Result<()> {
+        eprintln!(
+            "redbear-sessiond: Kill requested for session {} (who={who}, signal={signal_number}) — no-op",
+            self.runtime()?.session_id
+        );
+        Ok(())
+    }
+
     #[zbus(property(emits_changed_signal = "const"), name = "Active")]
     fn active(&self) -> bool {
         self.runtime().map(|runtime| runtime.active).unwrap_or(true)