simplify installer, drop eval, fix network check

docs/PHILOSOPHY.md

@@ -65,6 +65,32 @@ you fetch exactly the parts you picked.
 > fit-to-request. If you want fast and prebaked, a binary distro is right
 > there. If you want your machine, this is the one."
 
+## Stability: guaranteed on what's offered, never enforced on you
+
+Keru's promise is that **the system won't break** — but honestly scoped: it
+won't break **on the combinations it offers you**. That is what the installer
+means by offering a choice: each option in `install.sh` is one Keru has proven
+builds and boots. The offered set is curated *so that* it doesn't break.
+
+Choice multiplies the test surface — six inits, four libcs, seven filesystems,
+five kernels, and so on produce over a thousand possible systems. Guaranteeing
+every one of them is only honest if it's *enforced by curation*: Keru offers
+what works.
+
+But the user is never locked out of going further. If you pick something that
+isn't yet proven — a libc and init never tested together, an unmaintained
+filesystem, an exotic kernel pair — Keru does **not** stop you. It **warns
+you** the combination is unstable and lets you proceed.
+
+> "Stability is a guarantee about what we offer, not a jail around the edge of
+> it. If you want to push into the unproven, we tell you the truth and get out
+> of your way."
+
+So the full definition, in one line:
+
+> **The system won't break for any choice Keru offers you; for anything beyond
+> that, Keru warns and steps aside — you stay in control, never blocked.**
+
 ## Agreement on choice, not agreement on opinion
 
 The through-line across Keru's lineage is clear: TOML packages, then a