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]>

tests/test-classroom-migrate-config.sh

@@ -107,8 +107,7 @@ check("the password is untouched",
 check("and is never printed", "hunter2" not in output)
 check("the compositor setting is gone", "COMPOSITOR" not in after)
 check("and the appearance setting with it", "HYPR_APPEARANCE" not in after)
-check("the channel moves off the experiment",
-      "CHANNEL=classroom-v2" in after)
+check("the channel comes home to stable", "CHANNEL=stable" in after)
 check("the room's scale is preserved", "UI_SCALE=2.0" in after)
 check("and everything else is left alone",
       "UPDATE_URL=https://updates.riverofglorymn.org" in after
@@ -146,13 +145,13 @@ check("the settings are added", "MQTT_ENABLED=true" in after
       and "MQTT_HOST=10.40.0.2" in after and "MQTT_PORT=1883" in after)
 check("no credentials are invented",
       "MQTT_USERNAME" not in after and "MQTT_PASSWORD" not in after)
-# stable and canary are both the sway line. A machine that has just taken
-# the Plasma package and is left pointed at one of them is handed the old
-# desktop back by the next release there: the upgrade undoing itself.
-check("canary moves onto the v2 channel", "CHANNEL=classroom-v2" in after)
+# canary is where the next development release goes. A room somebody put
+# there is a room somebody meant to put there.
+check("canary is left where it is", "CHANNEL=canary" in after)
 
-after, _ = migrate("CHANNEL=stable\nUI_SCALE=1.0\n")
-check("and so does stable", "CHANNEL=classroom-v2" in after)
+after, _ = migrate("CHANNEL=classroom-v2\nUI_SCALE=1.0\n")
+check("and the experiment's own channel comes home",
+      "CHANNEL=stable" in after)
 
 print()
 print("4. running it twice changes nothing the second time")