agent: repoint roles to frank-medium/dankclaw-3090; sync niri tweaks, memories, managed skills

- config.yml: default/commit -> frank-medium (dankserver); task/tiny/smol/vision -> frank-small (dankclaw-3090); vision xhigh
- models.yml: add llamacpp (dankclaw-3090) provider; frank-large preserve_thinking + context notes
- niri: focus-ring/border/shadow layout, hot-corners off, re-add noctalia.kdl include; blankpad eDP-1 scale 1.0
- memories: flush rollouts; retire frank_large + marreta_authentik skills; add auth-chain/kv-pool/quadlet-log skills
- managed-skills: 40+ new fleet runbook skills
- agent/skills: import built-in skill set

dotfiles/niri/.config/niri/cfg/layout.kdl

@@ -8,7 +8,18 @@
             proportion 0.33333
             proportion 0.5
             proportion 0.66667
-        }
-
-        struts {}
+        proportion 0.875
     }
+
+        struts {
+    }
+    shadow
+    focus-ring {
+        width 2
+
+        active-color "#e01b24"
+    }
+    border {
+        off
+    }
+}