internal/pkg: exclusive artifacts

This alleviates scheduler overhead when curing many artifacts.

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

internal/pkg/net.go

@@ -40,7 +40,7 @@ func NewHTTPGet(
 }
 
 // Kind returns the hardcoded [Kind] constant.
-func (a *httpArtifact) Kind() Kind { return KindHTTPGet }
+func (*httpArtifact) Kind() Kind { return KindHTTPGet }
 
 // Params writes the backing url string. Client is not represented as it does
 // not affect [Cache.Cure] outcome.
@@ -49,7 +49,10 @@ func (a *httpArtifact) Params(ctx *IContext) {
 }
 
 // Dependencies returns a nil slice.
-func (a *httpArtifact) Dependencies() []Artifact { return nil }
+func (*httpArtifact) Dependencies() []Artifact { return nil }
+
+// IsExclusive returns false: Cure returns as soon as a response is received.
+func (*httpArtifact) IsExclusive() bool { return false }
 
 // Checksum returns the caller-supplied checksum.
 func (a *httpArtifact) Checksum() Checksum { return a.checksum.Value() }