Serve a key's kept values so the issue tracker can carry them into its log (ADR 0307, issue 502)

mesh/state.history answers every value a bucket still keeps for a key,
oldest first, to whoever may get it, by the same watch the runtime already
uses, so no new grant is needed.

node-tools/internal/runtime/runtime.go

@@ -614,8 +614,8 @@ type stateAsked struct {
 	Revision uint64          `json:"revision"`
 }
 
-// State answers a bundle's `get`, `put`, `delete` and `keys` on its module's state (ADR 0201). The
-// runtime refuses, with the reason, a state the module was not issued and a write to one it only reads.
+// State answers a bundle's `get`, `put`, `delete`, `keys`, `create`, `update` and `history` on its
+// module's state (ADR 0201, ADR 0259, ADR 0307). The runtime refuses, with the reason, a state the module was not issued and a write to one it only reads.
 func (b *moduleBus) State(verb string, params json.RawMessage) (json.RawMessage, error) {
 	var asked stateAsked
 	if err := json.Unmarshal(params, &asked); err != nil || asked.State == "" {
@@ -633,6 +633,13 @@ func (b *moduleBus) State(verb string, params json.RawMessage) (json.RawMessage,
 			return json.RawMessage("null"), nil
 		}
 		answer = entry
+	case "history":
+		// Every value the bucket still keeps for the key, oldest first (novox/hq ADR 0307).
+		kept, err := conn.StateHistory(b.module, asked.State, asked.Key)
+		if err != nil {
+			return nil, err
+		}
+		answer = kept
 	case "put":
 		revision, err := conn.StatePut(b.module, asked.State, asked.Key, asked.Value)
 		if err != nil {