docs: record what building the package taught

Co-Authored-By: Claude Opus 5 <[email protected]>

docs/classroom-v2-experiment.md

@@ -173,6 +173,21 @@ hard that `classroom-theme light` changed the running session and lost the
 change at the next start. Immutability now covers the Kiosk restrictions and
 nothing else. Measured both ways afterwards.
 
+### Two packages cannot own one file
+
+`dpkg -i` refused the first package outright: `plasma-workspace` already
+owns `/etc/xdg/plasmanotifyrc`, and `kdeglobals`, `kwinrc` and the rest are
+the same story. The room's settings live in
+`/etc/ekklesia-classroom/xdg/` instead, with
+`/etc/environment.d/90-ekklesia-classroom.conf` putting that directory in
+front of `/etc/xdg` in `XDG_CONFIG_DIRS`. That is KConfig's own cascade
+rather than a fight over a path, and it was checked at runtime:
+`systemctl --user show-environment` carries it, and `kreadconfig6` in the
+session reads the classroom's values.
+
+The `postinst` then failed on a `chmod` for a command that had been
+removed. It walks what the package actually installed now.
+
 ### VLC calls itself `Vlc`
 
 KWin's window matching is case sensitive, and a lower-case substring rule
@@ -394,6 +409,29 @@ Chromium ships no Widevine. Chrome is what Wonder Ink is known to work in.
 | right-click desktop / panel | no menu |
 | KRunner | not running, not reachable |
 | light ⇄ dark | persists both ways |
+| memory, 3 samples over 6 minutes | flat: plasmashell 399 MB, KWin 141 MB under llvmpipe |
+| package install on a clean machine | clean, and the session came up from it |
+
+## The package
+
+`tools/build-release.sh` builds it, and it was installed on a fresh machine
+and booted from rather than described. `ekklesia-classroom_0.1.45` is 65
+files: the desktop under `/etc/ekklesia-classroom/xdg`, a look and feel
+package, two colour schemes, the launchers, the Solid action, two supervised
+user services, and the classroom's own commands. Dependencies swap
+`sway, swaybg, waybar, mako-notifier, python3-gi, gir1.2-gtklayershell-0.1`
+for `plasma-desktop, plasma-workspace, kwin-wayland, plasma-nm, plasma-pa,
+sddm`, and it `Conflicts` with the welcome tour, the software centre and the
+phone pairing daemon that `plasma-desktop` would otherwise recommend into a
+classroom.
+
+Checked mechanically: every `/usr/local` path any classroom command names is
+in the package.
+
+The OTA mechanism is untouched. This is an ordinary version on the ordinary
+channel structure, and an experimental build would go out as
+`0.1.45~plasma1` on a channel of its own, exactly as the Hyprland milestone
+did.
 
 ## Screenshots