docs(defaults): scope the kube-version invariant to the constant

Review feedback: the invariant sentence read as though it bound the whole
kube-version resolution path. It does not. KubeVersionFromConstraints
returns the recipe's own value, and extractVersion(">= 1.25") yields
"1.25", so a recipe carrying only base.yaml's floor renders with
--kube-version 1.25 — below the stated invariant.

Scope the sentence to this constant and note that the constraint path is
unbounded below, so the comment cannot be read as a guarantee about
rendering in general.

Comment-only; no behavior change.

Signed-off-by: Yuan Chen <yuanchen97@gmail.com>

Author: yuanchen8911

pkg/defaults/timeouts.go

@@ -1255,12 +1255,17 @@ const (
 	// default (currently v1.27.0 in Helm 3.x), which is too old for
 	// charts that declare a kubeVersion constraint (e.g., >=1.32.0-0).
 	//
-	// This is a render-safe fallback, not a support floor. It must stay at
-	// or above the strictest kubeVersion any bundled chart declares. Do NOT
-	// lower it to match the ">= 1.25" recipe floor in
+	// This is a render-safe fallback, not a support floor. This constant
+	// must stay at or above the strictest kubeVersion any bundled chart
+	// declares. Do NOT lower it to match the ">= 1.25" recipe floor in
 	// recipes/overlays/base.yaml: that is the constraint recipes are
 	// validated against, and a recipe that declares one never reaches this
 	// default (see mirror.KubeVersionFromConstraints).
+	//
+	// The invariant binds this constant only. The constraint path is
+	// unbounded below: KubeVersionFromConstraints returns the recipe's own
+	// value, so a recipe carrying nothing but base.yaml's ">= 1.25" renders
+	// with --kube-version 1.25.
 	MirrorDefaultKubeVersion = "1.33.0"
 
 	// MirrorDiscoveryConcurrency caps the number of components rendered in