G findings: the runner's first views write their unanswered finding through one held writer over its own connection

bus.Conn gains its one JetStream accessor; firstview keeps the runner's own consumer and its four followers and writes and clears each follower's first-view-unanswered finding with the contract's Finding.

Builds: design 47 G A-27, A-28, A-16, A-29

node-tools/internal/bus/bindings.go

@@ -58,15 +58,16 @@ func (c *Conn) Bindings(module string) []membership.BusBinding {
 	return nil
 }
 
-// jetStream is a JetStream handle on this connection.
-func (c *Conn) jetStream() (jetstream.JetStream, error) { return jetstream.New(c.nc) }
+// JetStream is a JetStream handle on this connection: its one accessor, for a part that hands it to a finding writer (design 47 G
+// A-16, A-27).
+func (c *Conn) JetStream() (jetstream.JetStream, error) { return jetstream.New(c.nc) }
 
 func (c *Conn) objectStore(ctx context.Context, module, local string) (jetstream.ObjectStore, membership.BusBinding, error) {
 	b, err := c.Binding(module, local, catalogue.StorageObjectStore)
 	if err != nil {
 		return nil, b, err
 	}
-	js, err := c.jetStream()
+	js, err := c.JetStream()
 	if err != nil {
 		return nil, b, err
 	}
@@ -238,7 +239,7 @@ func (c *Conn) ObjectsWatch(module string, r buscalls.ObjectsWatchRequest, deliv
 func (c *Conn) streamFill(name string) (buscalls.StreamFilled, error) {
 	ctx, cancel := context.WithTimeout(context.Background(), StateTimeout)
 	defer cancel()
-	js, err := c.jetStream()
+	js, err := c.JetStream()
 	if err != nil {
 		return buscalls.StreamFilled{}, err
 	}
@@ -301,7 +302,7 @@ func (c *Conn) readStream(name, filter string, from uint64, limit int) (buscalls
 	}
 	ctx, cancel := context.WithTimeout(context.Background(), StateTimeout)
 	defer cancel()
-	js, err := c.jetStream()
+	js, err := c.JetStream()
 	if err != nil {
 		return buscalls.StreamPage{}, err
 	}
@@ -361,7 +362,7 @@ func (c *Conn) WorkQueueDead(module string, r buscalls.WorkQueueDeadRequest) (bu
 	}
 	ctx, cancel := context.WithTimeout(context.Background(), StateTimeout)
 	defer cancel()
-	js, err := c.jetStream()
+	js, err := c.JetStream()
 	if err != nil {
 		return buscalls.WorkQueueDeadLetters{}, err
 	}

node-tools/internal/bus/ledger.go

@@ -82,7 +82,7 @@ func publishExpecting(c *Conn, subject string, body []byte, expect uint64) (uint
 func lastOn(c *Conn, stream, subject string) ([]byte, uint64, error) {
 	ctx, cancel := context.WithTimeout(context.Background(), StateTimeout)
 	defer cancel()
-	js, err := c.jetStream()
+	js, err := c.JetStream()
 	if err != nil {
 		return nil, 0, err
 	}
@@ -149,7 +149,7 @@ type busState struct {
 }
 
 func (s *busState) kv(ctx context.Context) (jetstream.KeyValue, error) {
-	js, err := s.c.jetStream()
+	js, err := s.c.JetStream()
 	if err != nil {
 		return nil, err
 	}

node-tools/internal/bus/sent.go

@@ -25,7 +25,7 @@ func (c *Conn) SentGet(r buscalls.ObjectsSentGetRequest) (*buscalls.ObjectData,
 		return nil, fmt.Errorf("%s is no sent store (a module's is `<module>%s%s`): only a sent object is read by its reference",
 			r.Store, catalogue.BusNameSeparator, catalogue.SentObjectsLocal)
 	}
-	js, err := c.jetStream()
+	js, err := c.JetStream()
 	if err != nil {
 		return nil, err
 	}