release: the Plasma classroom becomes stable 0.2.0

0.1.50 was taken to the church and the things a container cannot answer
were answered on the hardware: boot, autologin, the panel after a reboot,
panel and browser scaling, Wonder Ink, Parent Call opening in the corner
and reaching the sanctuary with a typed name, readable and silent
notifications, HDMI audio and the volume keys.

The promotion is a fast-forward. The experiment was cut from the
published stable source and never diverged from it, so master reaches
this work without a merge and there is one history.

One thing changed for the release. The channel rules turn around:
classroom-v2 and hyprland are the obsolete channels now and a room on
either comes home to stable, while canary — where the next development
release goes — and any channel somebody named by hand stay where they
were put. A fresh installation has always defaulted to stable.

Nothing else moved. This is the 0.1.50 that was verified, with a version
number and a channel rule.

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

tools/validate-trixie-release.sh

@@ -147,11 +147,19 @@ if [[ -n "$previous" ]]; then
     grep -q '^MQTT_PASSWORD=preserve-me$' /etc/ekklesia-classroom/device.conf
     grep -q '^CUSTOM_SETTING=preserve-me-too$' /etc/ekklesia-classroom/device.conf
 
-    # And the one value the upgrade is supposed to change. canary is the
-    # sway line: a room that has just taken the Plasma package and is left
-    # pointed at it is handed the old desktop back by the next release
-    # there, which is the upgrade undoing itself.
-    grep -q '^CHANNEL=classroom-v2$' /etc/ekklesia-classroom/device.conf
+    # The channel a room was put on deliberately survives the upgrade.
+    # canary is where the next development release goes, and the Plasma
+    # classroom is the stable line now, so nothing here has to move.
+    grep -q '^CHANNEL=canary$' /etc/ekklesia-classroom/device.conf
+
+    # And a room that was carried through the experiment on its own
+    # channel comes home, because that channel is the obsolete one now.
+    sed -i 's/^CHANNEL=.*/CHANNEL=classroom-v2/' /etc/ekklesia-classroom/device.conf
+    classroom-migrate >/tmp/migrate-from-v2.log 2>&1
+    grep -q '^CHANNEL=stable$' /etc/ekklesia-classroom/device.conf
+    grep -q '^MQTT_PASSWORD=preserve-me$' /etc/ekklesia-classroom/device.conf
+    grep -q '^CUSTOM_SETTING=preserve-me-too$' /etc/ekklesia-classroom/device.conf
+    sed -i 's/^CHANNEL=.*/CHANNEL=canary/' /etc/ekklesia-classroom/device.conf
 
     # Every setting this release has that the room predates, appended
     # exactly once. classroom-migrate hands device.conf to the shared
@@ -171,7 +179,7 @@ if [[ -n "$previous" ]]; then
     done
     grep -q '^MQTT_PASSWORD=preserve-me$' /etc/ekklesia-classroom/device.conf
     grep -q '^CUSTOM_SETTING=preserve-me-too$' /etc/ekklesia-classroom/device.conf
-    grep -q '^CHANNEL=classroom-v2$' /etc/ekklesia-classroom/device.conf
+    grep -q '^CHANNEL=canary$' /etc/ekklesia-classroom/device.conf
 
     # And by hand, on a machine that is already converged: the command a
     # technician runs must be safe to run twice.