Why two kernels?
Linux Zen is the default direction for normal use. Linux LTS stays installed as a fallback because new kernels, drivers and hardware occasionally decide to have a disagreement without inviting you.
Installing the fallback after the primary kernel stops booting would be a pretty bad recovery strategy, so it is there from the start.
How boot is framed
In Phase 2, GRUB is the only installed and validated bootloader path. Zen must be the default and LTS must remain visible and selectable as a real alternative.
Limine stays isolated research for this phase even though the general architecture leaves room for it later.
When it matters
If a primary-kernel update breaks an important path, the goal is to have a known boot option before preparing recovery media. Recovery still exists; the first fallback is simply already there.
What Phase 2 must prove
Two menu labels are not proof. The ISO and installed system must demonstrate the default kernel, LTS selection, correct initramfs payloads and GRUB boot in virtual testing before the phase closes.
Current status
Both kernels are part of Phase 2 implementation. The Virtual gate is still pending, so remote configuration and tests do not automatically become proof of runtime boot.