iso: fix packages.x86_64 (no inline comments; gstreamer-vaapi -> gst-plugin-va)

Inline comments after a package name broke kitty/flatpak (became invalid
names with trailing whitespace). gstreamer-vaapi was removed from Arch.
calamares is AUR-only -> commented pending a [tanin] rebuild decision.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

iso/build-profile/airootfs/etc/systemd/system/livecd-talk.service

@@ -0,0 +1,20 @@
+[Unit]
+Description=Screen reader service
+After=livecd-alsa-unmuter.service
+Before=getty@tty1.service
+ConditionKernelCommandLine=accessibility=on
+
+[Service]
+Type=oneshot
+TTYPath=/dev/tty13
+ExecStartPre=/usr/bin/chvt 13
+ExecStart=/usr/local/bin/livecd-sound -p
+ExecStartPost=/usr/bin/chvt 1
+ExecStartPost=systemctl start espeakup.service
+StandardInput=tty
+TTYVHangup=yes
+TTYVTDisallocate=yes
+RemainAfterExit=true
+
+[Install]
+WantedBy=multi-user.target