Knowledge base: progress says how far a design, milestone, issue or record has come (issue 1947)

A lead's five-minute report and 'is design 47 nearing its end' were joined by hand from
the design file, the tracker and the deliveries. One verb now works the state out
(ADR 0424 §1), minimal for every five minutes, detailed for the report's tree.
Milestones are read from the design's table until the tracker's milestone records
(issue 1781) are delivered.

modules/mesh-knowledge/cmd/mesh-knowledge/kb.go

@@ -99,6 +99,13 @@ type KB struct {
 	refMu sync.Mutex
 	ref   *Reference
 	refAt time.Time
+
+	// Seats reaches another seat's verb or a module's tool over the bus, for progress (novox/hq issue 1947).
+	Seats SeatAsk
+	// progCache is the designs read at one commit of hq; progReads counts the documents read, for its test.
+	progMu    sync.Mutex
+	progCache *designsCache
+	progReads int
 }
 
 func (k *KB) now() time.Time {