docs: update README and DECISIONS for archinstall v4 and kanshi fixes

README.md

@@ -22,7 +22,7 @@ desktop that can be rebuilt from scratch in minutes.
 | **Terminal** | [Foot](https://codeberg.org/dnkl/foot) | Fast, minimal Wayland-native terminal. Server mode for instant window spawning. |
 | **Shell** | Zsh | Programmable completion, FZF integration, syntax highlighting. |
 | **Audio** | PipeWire | Drop-in replacement for PulseAudio/JACK with lower latency. RNNoise input denoising configured out of the box. |
-| **Display Management** | [kanshi](https://sr.ht/~emersion/kanshi/) + [wdisplays](https://github.com/artizirk/wdisplays) | kanshi auto-switches output profiles on hotplug. wdisplays for manual GUI configuration. |
+| **Display Management** | [kanshi](https://sr.ht/~emersion/kanshi/) + [wdisplays-persistent](https://github.com/sfs-pra/wdisplays) | kanshi auto-switches output profiles on hotplug. wdisplays-persistent saves changes directly to kanshi config. |
 | **Notifications** | [swaync](https://github.com/ErikReider/SwayNotificationCenter) | GTK4 notification daemon with DND toggle, grouping, MPRIS support. Fractional scaling via native GTK4. |
 | **Clipboard** | [cliphist](https://github.com/sentriz/cliphist) + Walker | Clipboard history stored in runtime dir, wiped on session start. Walker provides the picker UI. |
 | **GTK Theme** | Colloid-Grey-Dark-Catppuccin | Catppuccin Mocha palette, grey accent, explicit dark variant. |
@@ -79,7 +79,7 @@ The script will:
 2. Back up your `~/.config/`, `~/.zshrc`, and `/etc/xdg/` to timestamped tar archives
 3. Disable conflicting display managers (SDDM, GDM, LightDM, etc.)
 4. Remove conflicting packages (e.g. PulseAudio → PipeWire)
-5. Install all Moonarch packages and configs (**hard overwrite** of all user configs)
+5. Install all Moonarch packages and configs (**hard overwrite** of most user configs; kanshi display profiles are preserved)
 6. Enable greetd, firewall, and system services
 
 ### Update
@@ -115,7 +115,7 @@ defaults/
     walker/config.toml, themes/   Launcher: Walker config + gtk-inherit theme
     foot/foot.ini                 Terminal: font, colors, keybinds
     swaync/config.json, style.css Notifications: appearance, behavior, MPRIS
-    kanshi/config                 Display profiles (empty, user-configured)
+    kanshi/config                 Display profiles (empty seed, user-configured via wdisplays)
     stasis/stasis.rune            Idle manager: AC/battery power plans
     pipewire/                     Audio: RNNoise input denoising
     waypaper/config.ini           Wallpaper manager: backend, folder, transitions