Resume a backup the node agent's own stop interrupted, and keep what a held module runs

On novox (2026-10-31) postgres's repeat backup was interrupted by the node-engine's
restart: its held have named no build, so the node's own composition took postgres in
and was refused for its secret reader, and nothing ran the backup again. Issue 1289
(R4c, its delivery held).

- A held have names what runs: read from the module's have before backing-up when
  the agent has no running entry, as the not-composed mark does.
- A have in any phase but running that names nothing is not run inside the node's own.
- A backup interrupted by the agent's stop is no failure: the next start backs the
  module up again and applies while the want asks a backup. A real failure stays
  held for the operator's answer.

Quick fix: a new backup ask by hand. Thorough, chosen: the fault fixed where it lives
in the node agent, so every data module's interrupted backup resumes by itself.

Claude-Session: https://claude.ai/code/session_01NcbgfJ9Gum47zkFKWRaovL

cmd/mesh-host/backup_event_test.go

@@ -9,6 +9,7 @@ import (
 	"testing"
 	"time"
 
+	"github.com/novox/mesh-host/internal/agent"
 	"github.com/novox/mesh-host/internal/link"
 )
 
@@ -43,6 +44,17 @@ func TestABackupEndsWhenItsEventSaysSo(t *testing.T) {
 	if done, words := run(50 * time.Millisecond); done || !strings.Contains(words, "did not say it was done") {
 		t.Errorf("silence within the bound: done=%v words=%q", done, words)
 	}
+	// The node agent stopping while it waits is no failure of the backup: said as interrupted, so its next start backs
+	// the module up again (postgres on novox, 2026-10-31).
+	stopped, cancel := context.WithCancel(context.Background())
+	cancel()
+	if got := awaitBackup(stopped, make(chan []byte), "n1", "db", since, time.Second); got.Done || !got.Interrupted ||
+		got.Words != agent.BackupInterrupted {
+		t.Errorf("a stopped node agent: %+v", got)
+	}
+	if got := awaitBackup(context.Background(), make(chan []byte), "n1", "db", since, 10*time.Millisecond); got.Interrupted {
+		t.Errorf("silence within the bound taken as interrupted: %+v", got)
+	}
 
 	// The ask that starts it (sweep 2026-10-30): one that never reached the holder (nothing on this machine answers it
 	// while the tool runner restarts) is asked again within its bound, and past it fails saying so; one that may have

cmd/mesh-host/nodeagent.go

@@ -222,7 +222,7 @@ func awaitBackup(ctx context.Context, events <-chan []byte, node, module string,
 	for {
 		select {
 		case <-ctx.Done():
-			return agent.Backup{Words: "the node agent was stopped while the backup ran"}
+			return agent.Backup{Words: agent.BackupInterrupted, Interrupted: true}
 		case <-bound.C:
 			return agent.Backup{Words: fmt.Sprintf("the backup did not say it was done within %s", within)}
 		case raw := <-events: