iso: fresh work dir each build (avoid stale-stage reuse) + modern bootmodes

mkarchiso reuses completed stages in the work dir -> a 'too short' build that
ships a stale airootfs. bootstrap now 'rm -rf' the work dir first. Also switch
profiledef bootmodes to the non-deprecated names (bios.syslinux, uefi.systemd-boot).

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

iso/build-profile/airootfs/etc/calamares/modules/shellprocess-striplive.conf

@@ -6,6 +6,6 @@ timeout: 30
 script:
 - "rm -f /etc/systemd/system/getty@tty1.service.d/autologin.conf"
 - "rmdir --ignore-fail-on-non-empty /etc/systemd/system/getty@tty1.service.d 2>/dev/null || true"
-- "rm -f /root/.bash_profile"
+- "rm -f /root/.zprofile"
 - "rm -f /usr/local/bin/tanin-installer"
 - "systemctl set-default graphical.target"

iso/build-profile/airootfs/etc/hostname

@@ -1 +1 @@
-archiso
+taninux

iso/build-profile/airootfs/etc/motd

@@ -1,11 +1,5 @@
-To install Arch Linux follow the installation guide:
-https://wiki.archlinux.org/title/Installation_guide
 
-For Wi-Fi, authenticate to the wireless network using the iwctl utility.
-For mobile broadband (WWAN) modems, connect with the mmcli utility.
-Ethernet, WLAN and WWAN interfaces using DHCP should work automatically.
+  TANINUX (camel) — a curated Arch desktop: niri + eww.
 
-After connecting to the internet, the installation guide can be accessed
-via the convenience script Installation_guide.
+  The installer launches on tty1. To start it manually:  tanin-installer
 
-                                          

iso/build-profile/airootfs/etc/os-release

@@ -0,0 +1,11 @@
+NAME="TANINUX"
+PRETTY_NAME="TANINUX (camel)"
+ID=taninux
+ID_LIKE=arch
+BUILD_ID=rolling
+ANSI_COLOR="38;2;163;158;196"
+HOME_URL="https://taninux.kgva.ch"
+DOCUMENTATION_URL="https://git.openbureau.ch/karim/taninux"
+SUPPORT_URL="https://git.openbureau.ch/karim/taninux"
+BUG_REPORT_URL="https://git.openbureau.ch/karim/taninux/issues"
+LOGO=taninux