docs: close the checkpoint with the from-package reproduction

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

docs/classroom-v2-experiment.md

@@ -58,6 +58,7 @@ can photograph it and a real pointer can be aimed at it.
 
 ```
 tools/lab/lab build          # the image
+tools/lab/from-package       # a fresh machine, the .deb, and nothing else
 tools/lab/cold-start 3       # three complete cold starts, from nothing
 tools/lab/lab session        # compositor + Plasma session
 tools/lab/lab shot NAME      # docs/screenshots/NAME.png
@@ -574,9 +575,21 @@ The existing Debian classroom test VM should be kept.
 * Secondary windows, print dialog, notifications, fullscreen, themes, lockdown
   all verified on a running session.
 * Audio policy written with the failing room as a test.
-* Cold starts repeated.
+* Cold starts repeated: eleven, identical.
+* Package built, and the file conflict and the stale `postinst` it exposed
+  both fixed.
+* `tools/lab/from-package` run: fresh machine, `.deb`, session up, both
+  applications launched, one button each.
 
-**Next**: SDDM autologin; move the file list in `tools/build-release.sh` to
-the Plasma layout and build a `0.1.45~plasma1` package on its own channel;
-Plasma display scaling at 1.25 and 1.5; then a real VM for DVD, audio and
-performance.
+**Next**, in order:
+
+1. Port `classroom-window` off sway so the DVD player is whole. It is the
+   last thing on this branch that still speaks a compositor the classroom
+   no longer runs.
+2. Publish `0.1.45~plasma1` to a channel of its own, the way the Hyprland
+   milestone did, so a stable or canary room can never be offered it.
+3. Bench-test SDDM: autologin, and that ending the session brings the
+   classroom back rather than a shell.
+4. On real hardware: a DVD, a television switched on after the computer,
+   printing to Elmer, display scaling at 1.25 and 1.5, and a weekend of
+   uptime.