RR-3: the manifest reader reads an artifact's needs

The reader release reads the manifest words G writes: version MAJOR.MINOR, a * emitter in consumes and an
observer's finding stream already read; an artifact's needs is new.

Builds: design 47 G §340, §409, §47, §432, §368, §386, §387

Claude-Session: https://claude.ai/code/session_01JG73KEq4zoDfM9WtYpcQgZ

go/catalogue/manifest.go

@@ -1236,6 +1236,11 @@ type Artifact struct {
 	// DefaultSeries (SeriesOf).
 	Series string `json:"series,omitempty"`
 
+	// Needs are the artifact references, `<module>:<artifact>`, of the catalog graph's edges this artifact has where no
+	// other line of the manifest or of a seat's definition says them (design 47 G §47, §432). Read here so a reader
+	// release keeps a manifest that names them whole (design 47 G §340, §409); the manifest validator checks their form.
+	Needs []string `json:"needs,omitempty"`
+
 	// GeneratedFrom marks a package of a contracts module (novox/hq ADR 0608 §5, design 26 *Contracts modules*): the
 	// directory, relative to the module's, of the seat definitions every file of the package is generated from. A
 	// module carrying it holds contracts only and claims no seat, which the judge refuses naming the seat; the build

go/catalogue/reader_release_test.go

@@ -0,0 +1,20 @@
+package catalogue
+
+import "testing"
+
+// A manifest carrying the words design 47 G writes is read whole by the reader release (design 47 G §340, §409):
+// `version` as MAJOR.MINOR (§368), a `*` emitter in `consumes` (§386), an observer's finding stream (§387) and an
+// artifact's `needs` (§47, §432).
+func TestTheReaderReleaseReadsTheManifestWordsGWrites(t *testing.T) {
+	m, err := decodeForTest([]byte(`{"module":"mesh-watcher","version":"1.4",` +
+		`"consumes":["*.finding-written","mesh-conditions.findings-asked"],` +
+		`"streams":[{"name":"mesh-watcher-findings","events":["finding-written","finding-cleared","findings-stated"],"max-age-days":7,"max-mib":16}],` +
+		`"build":{"artifacts":[{"name":"program","kind":"bundle","language":"go","needs":["mesh-grants:program","node-tools:runtime"]}]}}`))
+	if err != nil {
+		t.Fatalf("a manifest with G's words was refused: %v", err)
+	}
+	if m.Version != "1.4" || m.Consumes[0] != "*.finding-written" || m.Streams[0].Name != "mesh-watcher-findings" ||
+		len(m.Build.Artifacts[0].Needs) != 2 || m.Build.Artifacts[0].Needs[0] != "mesh-grants:program" {
+		t.Fatalf("read as %+v", m)
+	}
+}