docs(niri): state the first-run experience and refresh the layout map

AGENTS.md layout now lists app_identity, legacy_import, model_ladder,
packaging/void, the perf protocol script, the Gitea workflows and the
niri doc, as its own maintenance rule requires.

USER_GUIDE orders Wayland autodetection wtype before ydotool, matching
the decided ladder, and says the portal is never tried on niri.
docs/NIRI.md states the niri first dictation (no prompt; typing goes
direct through wtype; IBus excluded) and points to the GNOME and KDE
section.

docs/NIRI.md

@@ -57,6 +57,15 @@ under **Settings → Shortcuts**; with it off, remove the niri bind. A key
 claimed on both sides fires twice: the compositor toggles over D-Bus while
 the internal listener fires on its own.
 
+## First dictation
+
+There is no permission prompt on niri. The RemoteDesktop portal is never
+used there, because no portal backend implements it, so your first dictation
+types straight into the focused window through `wtype` with nothing to approve
+or deny. Do not pin `portal` as a niri recommendation. IBus is excluded on
+niri as well. The GNOME and KDE first-run behaviour is described in
+[USER_GUIDE.md](USER_GUIDE.md#first-dictation-on-niri-gnome-and-kde).
+
 ## Hold-to-talk stays in the app
 
 A compositor bind only sends the key press; it never sees the release, so

docs/USER_GUIDE.md

@@ -343,8 +343,9 @@ in place and may select IBus. An explicit non-IBus pin (`portal`, `wtype`,
 
 On Wayland, when IBus is not selected, autodetection tries the RemoteDesktop
 portal first -- it is the only injection path Wayland officially supports and
-it needs no uinput device or helper daemon -- then `ydotool`, `wtype`, and
-finally `xdotool` under XWayland.
+it needs no uinput device or helper daemon -- then direct typing with `wtype`,
+then the virtual-input tool `ydotool`, and finally `xdotool` under XWayland.
+On niri the portal is never tried, because no backend there implements it.
 
 On X11 the injection tool is `xdotool` regardless of which non-`ibus` value you
 pin, so `xdotool` is the name to use there when IBus is unreliable in a