Remove i3 desktop profile and st terminal

Elimina completamente la sessione desktop i3 (X11), ormai non più usata
(gli host espongono solo sway e Hyprland su Wayland):
- ruolo profile_desktop_i3 e voce emptty i3.desktop
- desktop_i3_packages e i guard 'i3' in desktop_sessions_enabled
- desktop_i3_dotfiles e host_i3_dotfiles (autorandr X11)
- dotfiles i3/X11: .xinitrc, i3, i3blocks, picom, polybar, autorandr
- task host-specifici i3 (copy dotfiles, wrap prime-run su nymph)
- rimuove st (terminale X11 da sorgente) da desktop_void_source_tools
- consolida lo script live in scripts/remove_i3.sh, elimina cleanup-i3.sh
- aggiorna la documentazione (README/AGENTS/CLAUDE/knowledge)

Config Emacs lasciata invariata di proposito.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

dotfiles/nymph/.config/autorandr/dual/config

@@ -1,27 +0,0 @@
-output HDMI-1
-off
-output DP-2
-off
-output HDMI-2
-off
-output eDP-1
-crtc 0
-mode 1920x1080
-pos 0x0
-rate 60.01
-x-prop-broadcast_rgb Automatic
-x-prop-colorspace Default
-x-prop-max_bpc 12
-x-prop-non_desktop 0
-x-prop-scaling_mode Full aspect
-output DP-1
-crtc 1
-mode 3440x1440
-pos 1920x0
-primary
-rate 100.00
-x-prop-audio auto
-x-prop-broadcast_rgb Automatic
-x-prop-colorspace Default
-x-prop-max_bpc 12
-x-prop-non_desktop 0

dotfiles/nymph/.config/autorandr/dual/setup

@@ -1,2 +0,0 @@
-DP-1 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
-eDP-1 00ffffffffffff0006af3d1000000000001a0104951f117802c32592575a942a22505400000001010101010101010101010101010101143780b2703828403064310035ad100000180000000f0000000000000000000000000020000000fe0041554f0a202020202020202020000000fe004231343048414b30312e30200a00bd

dotfiles/nymph/.config/autorandr/solo/config

@@ -1,19 +0,0 @@
-output DP-1
-off
-output HDMI-1
-off
-output DP-2
-off
-output HDMI-2
-off
-output eDP-1
-crtc 0
-mode 1920x1080
-pos 0x0
-primary
-rate 60.01
-x-prop-broadcast_rgb Automatic
-x-prop-colorspace Default
-x-prop-max_bpc 12
-x-prop-non_desktop 0
-x-prop-scaling_mode Full aspect

dotfiles/nymph/.config/autorandr/solo/setup

@@ -1 +0,0 @@
-eDP-1 00ffffffffffff0006af3d1000000000001a0104951f117802c32592575a942a22505400000001010101010101010101010101010101143780b2703828403064310035ad100000180000000f0000000000000000000000000020000000fe0041554f0a202020202020202020000000fe004231343048414b30312e30200a00bd