internal/rosa: enforce exclusions

This restores unexported artifact behaviour.

Signed-off-by: Ophestra <cat@gensokyo.uk>

internal/rosa/package/kernel/package.az

@@ -1,6 +1,7 @@
 package kernel-source {
 	description = "unpatched Linux kernel source tree";
 	website = "https://kernel.org";
+	exclude = true;
 
 	version* = "6.12.87";
 	output = remoteTar {

internal/rosa/package/musl/package.az

@@ -1,5 +1,6 @@
 package musl-source {
 	description = "an implementation of the C standard library - source code";
+	exclude = true;
 
 	version* = "1.2.6";
 	output = remoteTar {

internal/rosa/package/stage0.az

@@ -1,5 +1,6 @@
 package stage0-dist {
 	description = "Rosa OS stage0 bootstrap seed";
+	exclude = true;
 
 	version* = "20260504";
 	output = remoteTar {

internal/rosa/state.go

@@ -384,14 +384,14 @@ func (s *S) mustRegister(
 	})
 }
 
-// Count returns the number of [Artifact] registered to s.
-func (s *S) Count() int {
+// count returns the number of [Artifact] registered to s.
+func (s *S) count() int {
 	return int(s.artifactCount.Load())
 }
 
-// Collect returns all [ArtifactH] registered to s.
-func (s *S) Collect() (handles P) {
-	handles = make(P, 0, s.Count())
+// CollectAll returns all [ArtifactH] registered to s.
+func (s *S) CollectAll() (handles P) {
+	handles = make(P, 0, s.count())
 	s.artifacts.Range(func(key, _ any) bool {
 		handles = append(handles, key.(ArtifactH))
 		return true
@@ -402,6 +402,23 @@ func (s *S) Collect() (handles P) {
 	return
 }
 
+// Collect returns all non-excluded [ArtifactH] registered to s.
+func (s *S) Collect() (handles P) {
+	handles = make(P, 0, s.count())
+	s.artifacts.Range(func(key, _ any) bool {
+		h := key.(ArtifactH)
+		meta, _ := s.Std().MustLoad(h)
+		if !meta.Exclude {
+			handles = append(handles, h)
+		}
+		return true
+	})
+	slices.SortFunc(handles, func(a, b ArtifactH) int {
+		return strings.Compare(a.String(), b.String())
+	})
+	return
+}
+
 // deferredGit is a call to Toolchain.newTagRemote from azalea.
 type deferredGit struct {
 	url      string
@@ -915,6 +932,7 @@ func (ctx *evalContext) pf(
 		k("description"): &meta.Description,
 		k("website"):     &meta.Website,
 		k("version"):     &meta.Version,
+		k("exclude"):     &meta.Exclude,
 		k("anitya"):      &anitya,
 		k("latest"):      &meta.latest,