Bake bread ecosystem into the ISO + full live desktop; fix installer timeout

- packages.x86_64: add bread, breadbar, breadbox, breadcrumbs, breadpad,
  bos-settings so they ship in the squashfs and reach the target via unpackfs
  (no network needed; install works fully offline)
- shellprocess.conf: set timeout 1800 — Calamares' 10s default was killing
  post-install.sh partway (the real cause of the empty /boot + ESP); the "-"
  prefix had been masking the kill as success
- bos-live-setup: live user now boots the real BOS desktop from /etc/skel
  (breadd + breadbar + breadbox) with the installer layered on top
  (auto-launch + Super+I), instead of an installer-only kiosk
- post-install.sh: drop the now-redundant networked `bakery install`

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

iso/packages.x86_64

@@ -82,8 +82,15 @@ nautilus
 # (calamares 3.4.x is already Qt6; there is no separate calamares-qt6 package)
 calamares
 
-# Bread ecosystem — sourced from [breadway] repo
+# Bread ecosystem — sourced from [breadway] repo. Baked into the squashfs so a
+# fresh install (and the live session) has the full desktop with no network.
 bakery
+bread
+breadbar
+breadbox
+breadcrumbs
+breadpad
+bos-settings
 
 # Input / screen utilities
 brightnessctl