feat(boss): Boss creates nests and assigns registry crows (#43)

server.go

@@ -46,8 +46,15 @@ func NewServer(ctx context.Context, p *Pipeline, approver *WebApprover, nests *N
 // WithMessages attaches the nest conversation log (chatroom path).
 func (s *Server) WithMessages(m *MessageStore) *Server { s.msgs = m; return s }
 
-// WithCrows attaches the spun-crow registry (the Boss writes through it).
-func (s *Server) WithCrows(c *CrowStore) *Server { s.crows = c; return s }
+// WithCrows attaches the spun-crow registry (the Boss writes through it) and
+// lets registry crows be nest members (#43).
+func (s *Server) WithCrows(c *CrowStore) *Server {
+	s.crows = c
+	if c != nil && s.nests != nil {
+		s.nests.AllowCrows(c.Has)
+	}
+	return s
+}
 
 func (s *Server) Handler() http.Handler {
 	mux := http.NewServeMux()