Add meta.profile constraints to the profiles that cannot be reliably disambiguated by other constraints - these profiles include the generic, lab, pathology and imaging Observation profiles (plus the generic and observer Device and laboratory and observation Organization profiles).  These additional meta.profile constraints are specified as optional (0..1) and mustSupport = false.  The intent is for them to not be required, but to be available whenever they are needed for reliable downstream disambiguation.  Also add the meta.profile constraints to the relevant example instances.