Improve end-of-install instructions

- Clear numbered steps for first boot process
- Emphasize entering passphrase twice (RAID1 setup)
- Mention automatic reboot after installation
- Cleaner, more actionable instructions

🤖 Generated with [Claude Code](https://claude.ai/code)

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

post-install.sh

@@ -470,11 +470,12 @@ else
 fi
 
 echo ""
-echo "IMPORTANT: The LUKS passphrase is set in install.conf"
-echo "Save it securely for recovery purposes."
+echo "IMPORTANT: Save the LUKS passphrase from install.conf securely!"
 echo ""
-echo "After reboot:"
-echo "- SSH to port 22 for remote unlock: ssh root@<server-ip>"
-echo "- Run 'unlock-luks' and follow the instructions to unlock LUKS"
-echo "- Once unlocked, SSH to port 22 as user '${ALMA_USER}'"
-echo "- LUKS passphrase: [see installer output]"
+echo "First Boot Instructions:"
+echo "1. System will reboot automatically after installation"
+echo "2. SSH as root: ssh root@<server-ip>"
+echo "3. Run 'unlock-luks' and enter LUKS passphrase TWICE (once per disk)"
+echo "4. System will boot normally, then SSH as user '${ALMA_USER}'"
+echo ""
+echo "For future unlocks, Clevis/Tang should handle this automatically."