Ask again for a folder that moved, and carry entries left while a disk was away (hq ADR 0325)

The engine names the filesystem a waiting folder is on; a warrant is recorded for that filesystem, and a
folder on another is asked about again and not taken there meanwhile. Entries the engine could not take
out while their disk was away, stated before a send, do not hold that delivery's gate. mesh-host pinned
to d2d9fbbd.

internal/link/protocol.go

@@ -601,6 +601,10 @@ type AccessWait struct {
 	Access string `json:"access"`
 	Part   string `json:"part"`
 	What   string `json:"what"`
+	// Placed names, with no path, the filesystem the folder is on now ("fs-<12 hex>"), on a wait for the operator's
+	// word: a warrant given for another filesystem (the folder moved) does not answer it, and the controller asks
+	// again (mesh-host internal/link AccessWait.Placed).
+	Placed string `json:"placed,omitempty"`
 }
 
 // WaitsForDisk says an access wait is for a disk that is not there (ADR 0325 §9) rather than for the operator's word
@@ -609,6 +613,11 @@ func (w AccessWait) WaitsForDisk() bool {
 	return strings.HasPrefix(strings.TrimSpace(w.What), "mount the disk")
 }
 
+// KindKeptEntries is the mesh's entries on a shared folder that nobody wants and that could not be taken out yet
+// because its disk was away (novox/hq ADR 0325 §8; mesh-host internal/link): unhealthy, said under the access that
+// last named it (`<access id>~entries`), which may no longer be declared. The node-engine's own.
+const KindKeptEntries = "kept-entries"
+
 // KeptEntry is one user of a kept folder as the engine's listing says it (ADR 0325 §4), with a note beside the tool
 // runner's entry.
 type KeptEntry struct {