Package list test: composer, parts and provider may not come back (S-8 part, B9f; issue 1966)

Claude-Session: https://claude.ai/code/session_01NcbgfFSnn24M3GcqttoU7i

go/packages_list_test.go

@@ -39,7 +39,7 @@ var clientSeats = []string{"operator-channel", "mesh-vault", "node-engine", "npm
 var moduleWord = regexp.MustCompile(`\bmesh-(?:delivery|grants|vault|host|config|provisioner|broker|knowledge|enrolment)\b[-a-z]*|\b(?:indexer|assigner|teller|watchman|checker|builder)(?:-views|_read_)`)
 
 // notInSDK are the packages that moved to a seat's client or contract (ADR 0627 §1, §4) and may not come back.
-var notInSDK = []string{"asks", "asker", "publish"}
+var notInSDK = []string{"asks", "asker", "publish", "composer", "parts", "provider"}
 
 // untilTheJoin is what ADR 0627 still moves at the group's join, each `<file>: <what>`, naming what the checks below
 // would refuse; it only shrinks. The vault module's name in delivery and provisions stays past this milestone's pin