A machine too small for the models it would serve is said so first

A control plane that is also a node, serving the starter model and two
judges, needs about 10.5 GB: 3.5 for itself, 2 for the starter, 2 for each
judge, and one more because the scheduler counts whole gigabytes. On 8 GB
the install did every step and then had nowhere to run the starter. The
setup's checks now fail this machine's memory and name what it would serve,
and server init refuses before it installs anything, naming the flags that
leave those models off it. quick-install.md said 8 GB; it says 12.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

internal/cli/serverinit_memory_test.go

@@ -0,0 +1,27 @@
+package cli
+
+import (
+	"testing"
+
+	"gitea.mynodes.xyz/ilker/llmgw/internal/preflight"
+)
+
+func TestTheMemoryAMachineNeedsCountsWhatItServes(t *testing.T) {
+	in := &serverInit{}
+	mb, what := in.servingMemoryMB(false)
+	need := preflight.Needs[preflight.RoleControl].MemoryMB + mb
+	if what == "" || need <= 7941 || need > 11961 {
+		t.Errorf("node, starter and judges here: need %d MB (%q); an 8 GB machine must fail and a 12 GB one pass", need, what)
+	}
+	// Judges on machines of their own take their share off this one.
+	if mb2, _ := in.servingMemoryMB(true); mb2 >= mb {
+		t.Errorf("with judge machines %d MB, without %d", mb2, mb)
+	}
+	// A control plane that serves nothing needs only its own.
+	if mb, what := (&serverInit{noNode: true}).servingMemoryMB(false); mb != 0 || what != "" {
+		t.Errorf("no node: %d %q", mb, what)
+	}
+	if mb, _ := (&serverInit{noModel: true, noGuardModel: true}).servingMemoryMB(false); mb != 0 {
+		t.Errorf("nothing served: %d", mb)
+	}
+}