release: 0.2.6.6, for the canary machine only

A desktop Plasma makes after the layout has run — the television arriving
after a night-time reboot, as on Tiny Pebbles — now shows the classroom's
wallpaper, and every existing desktop is repaired before the shell starts.
Carries 0.2.6.5's reboot that waits until nobody is using the computer.

Built from this commit, gated on that file, and published to canary as it
is; the file and its sha256 are recorded in the Gitea release v0.2.6.6 and
in docs/testing.md. Stable stays on 0.2.6.4.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

VERSION

@@ -1 +1 @@
-0.2.6.5
+0.2.6.6

docs/manual/build/classroom-manual.html

@@ -43,7 +43,7 @@ figcaption { color: #93a5aa; font-size: .9rem; margin-top: .4rem; }
 <body>
 <div class="sheet">
 <h1>Classroom manual</h1>
-<p class="revision">River of Glory &middot; Revision 26 September 2026</p>
+<p class="revision">River of Glory &middot; Revision 29 September 2026</p>
 <nav id='contents'></nav>
 <section id="00-welcome">
 <h2>Your classroom computer</h2>

docs/manual/build/classroom-manual.pdf

@@ -46,7 +46,7 @@ endobj
 stream
 BT /F2 26 Tf 1 0 0 1 62.0 720.0 Tm (Classroom manual) Tj ET
 BT /F1 13 Tf 1 0 0 1 62.0 677.1 Tm (River of Glory) Tj ET
-BT /F1 10.5 Tf 1 0 0 1 62.0 656.6 Tm (Revision 26 September 2026) Tj ET
+BT /F1 10.5 Tf 1 0 0 1 62.0 656.6 Tm (Revision 29 September 2026) Tj ET
 BT /F1 10.5 Tf 1 0 0 1 62.0 623.7 Tm (This manual covers every classroom computer in the church. Not every room has every button, so) Tj ET
 BT /F1 10.5 Tf 1 0 0 1 62.0 608.8 Tm (some pages begin by saying when they apply. If your computer does not have what a page describes,) Tj ET
 BT /F1 10.5 Tf 1 0 0 1 62.0 593.9 Tm (that page is not for your room.) Tj ET