Catalogue: a module's needs include its templates' text (ADR 0632 §2; issue 1966)

docker's daemon file and artifact-store-tools' store address move to the image
seat's reach in their templates while their manifests stay the same, so needs
read from the manifest alone let an engine before the reading lose the file.
ModuleNeeds reads the templates TemplatePaths names; the merge message carries
the result per directory for the indexer.

Claude-Session: https://claude.ai/code/session_01JG73KG7AfSdh6FP8VrBqCn

go/delivery/source.go

@@ -594,6 +594,10 @@ type Forge struct {
 	// relative to it (novox/hq ADR 0465 clause 1). Older writers send neither.
 	Manifests map[string]string            `json:"manifests,omitempty"`
 	Locks     map[string]map[string]string `json:"locks,omitempty"`
+	// Needs are, of each such directory whose manifest names templates, the reader capabilities of the module whole:
+	// its manifest's and its templates' text's at the same commit (catalogue.ModuleNeeds; novox/hq ADR 0632 §2). The
+	// indexer takes them over the manifest's own; a directory absent, or an older writer, has the manifest's alone.
+	Needs map[string][]string `json:"needs,omitempty"`
 	// Paths are, of each module directory whose manifest names paths on every artifact, each named path's git object
 	// id at the same commit as its manifest, by path relative to the directory (novox/hq ADR 0499 clause 3). The
 	// indexer names the paths; a message without them gives such a module none. Older writers send none.