Phase 0: browser X11-overlay inventory + mpv reference cell + tooling installs

Source-level verdict: no browser in the matrix has a code path
to hand NV12 to the X server for plane scanout. Chromium ozone-x11
wires StubOverlayManager (ozone_platform_x11.cc:262); Brave 147 +
chromium-fourier 149 inherit unchanged. Firefox WindowSurfaceX11
is RGB-only. The campaign's load-bearing hypothesis is structurally
weakened — what the X11 cells will measure for browsers is
KWin's per-frame RGB-recomposite cost, not the original
"force-GL-composite of NV12" framing. mpv --vo=xv becomes the
matrix's only direct test of the operator-supplied mechanism.

Matrix updated: 12 cells -> 16 cells (+8 mpv VO sub-points).
revert.log entries 1-5 capture all package + per-user state
mutations from this turn (measurement tools, openbox, XFCE +
xfwm4-no-comp pre-seed, firefox + AUR xtrace, XFCE rotation
+ touchscreen mapping); single SSH-driveable revert chain
returns ohm to its pre-campaign 1169-package state.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

phase0_evidence/x11_inventory_2026-05-03/entry2.added.list

@@ -0,0 +1,70 @@
+dbus-glib
+elementary-icon-theme
+exo
+garcon
+gnome-themes-extra
+gtk-layer-shell
+gtksourceview4
+libburn
+libgtop
+libisofs
+libkeybinder3
+libmpd
+libwnck3
+libxfce4ui
+libxfce4util
+libxfce4windowing
+libxklavier
+libxres
+mousepad
+parole
+polkit-gnome
+ristretto
+thunar
+thunar-archive-plugin
+thunar-media-tags-plugin
+thunar-volman
+tumbler
+xfburn
+xfce4-appfinder
+xfce4-battery-plugin
+xfce4-clipman-plugin
+xfce4-cpufreq-plugin
+xfce4-cpugraph-plugin
+xfce4-dict
+xfce4-diskperf-plugin
+xfce4-eyes-plugin
+xfce4-fsguard-plugin
+xfce4-genmon-plugin
+xfce4-mailwatch-plugin
+xfce4-mount-plugin
+xfce4-mpc-plugin
+xfce4-netload-plugin
+xfce4-notes-plugin
+xfce4-notifyd
+xfce4-panel
+xfce4-places-plugin
+xfce4-power-manager
+xfce4-pulseaudio-plugin
+xfce4-screensaver
+xfce4-screenshooter
+xfce4-sensors-plugin
+xfce4-session
+xfce4-settings
+xfce4-smartbookmark-plugin
+xfce4-systemload-plugin
+xfce4-taskmanager
+xfce4-terminal
+xfce4-time-out-plugin
+xfce4-timer-plugin
+xfce4-verve-plugin
+xfce4-wavelan-plugin
+xfce4-weather-plugin
+xfce4-whiskermenu-plugin
+xfce4-xkb-plugin
+xfconf
+xfdesktop
+xfwm4
+xorg-iceauth
+xorg-xinit
+xorg-xmodmap