A-371 grants-empty-first-view-of-its-own-stream: a kept stream grants creates and the bus lacks is an empty first view, no wait

Builds: design 47 G A-371 (G-22-lead-answers-2.md, hq design/47-G-lead-answers-31)
Note: the earlier commit 7f3aeedf (A-369, grants' Waiting asks Ready) is titled S6 by mistake.

Claude-Session: https://claude.ai/code/session_01NcbgfGKaxw984XyAPfLm4h

modules/mesh-grants/internal/grants/running.go

@@ -4,12 +4,15 @@ import (
 	"bytes"
 	"encoding/json"
 	"fmt"
+	"slices"
 	"sort"
 	"strings"
 	"time"
 
 	"git.novox.be/novox/mesh-contracts/go/seats/nodeengine"
 	"git.novox.be/novox/mesh-sdk/go/catalogue"
+
+	"mesh-grants/internal/buscompose"
 )
 
 // **What each node runs, as its node-engine says it** (novox/hq design 47, ADR 0660 §2): the seat node-engine's event