Node-engine: the placement's bucket and read names come from the assigner client (ADR 0634 §4; issue 1966)

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

internal/buckets/buckets.go

@@ -3,6 +3,12 @@
 // reads through grants composed in code, so the holder's name is kept here, in its own code (ADR 0634 §1, finding F4).
 package buckets
 
+import (
+	assigner "git.novox.be/novox/mesh-contracts/placement/go/clients/meshmoduleassignerclient"
+	seat "git.novox.be/novox/mesh-contracts/placement/go/seats/meshmoduleassigner"
+	wants "git.novox.be/novox/mesh-contracts/placement/go/seats/meshwants"
+)
+
 // The node-engine's own states and the have state, written by every node's engine for its own keys.
 const (
 	// Have holds a module's have on a node, `<node>.<module>`, and the node's own facts, `<node>.node`.
@@ -20,9 +26,9 @@ const HaveHistory = 20
 // module as every state is (ADR 0634 §1, finding F4: the holder's name is kept here, in the engine's code).
 const (
 	// Placement holds a node's placement, `<node>.node`, and each of its modules, `<node>.<module>`.
-	Placement = "mesh-delivery-assigner_placement"
+	Placement = assigner.PlacementBucket
 	// PlacementCandidates holds a node's candidate of a proposal, `<proposal>.<node>`.
-	PlacementCandidates = "mesh-delivery-assigner_candidates"
+	PlacementCandidates = assigner.Module + "_" + seat.StateCandidates
 	// Wants holds what each node should run, `want.<node>.<module>` and `want.<node>.node`.
-	Wants = "mesh-delivery-assigner_wants"
+	Wants = assigner.Module + "_" + wants.StateWants
 )

internal/compose/frombus/states.go

@@ -28,7 +28,7 @@ import (
 const (
 	// The holders' names are kept here, in the engine's own code, as the names of the states a manifest's reads use
 	// (ADR 0634 §1, finding F4); a seat's contract names a state locally, not the module that holds it.
-	PlacementRead = "mesh-delivery-assigner.placement"
+	PlacementRead = meshmoduleassignerclient.PlacementRead
 	ModulesRead   = "mesh-delivery-indexer.modules"
 	ManifestsRead = "mesh-delivery-indexer.manifests"
 	BuildsRead    = "mesh-delivery-builder.builds"