issue-tracker.changes reads each issue's moves over a window from the tracker's own log, so progress since says from what each issue moved, not only where it is

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

@@ -2,6 +2,7 @@ package main
 
 import (
 	"encoding/json"
+	"errors"
 	"fmt"
 	"os"
 	"path/filepath"
@@ -396,8 +397,10 @@ func TestProgressOfAnIssueAndARecord(t *testing.T) {
 }
 
 // sinceWorld plays the tracker and the delivery seat from what they answered on 2026-10-28 (testdata/progress/since):
-// a get or a show it holds no answer for is refused, as a seat that cannot answer.
-func sinceWorld(t *testing.T) func(string, any) (json.RawMessage, error) {
+// a get or a show it holds no answer for is refused, as a seat that cannot answer. The tracker's changes answers what
+// mesh-issues' verb made of 1422's open and move to fixing (testdata/progress/README.md); without changes it is
+// refused, as by a tracker that has no such verb yet.
+func sinceWorld(t *testing.T, changes bool) func(string, any) (json.RawMessage, error) {
 	t.Helper()
 	read := func(name string) json.RawMessage { return readFixture(t, filepath.Join("since", name)) }
 	var rows []json.RawMessage
@@ -432,6 +435,11 @@ func sinceWorld(t *testing.T) func(string, any) (json.RawMessage, error) {
 				}
 			}
 			return json.Marshal(map[string]any{"rows": out, "matched": len(out)})
+		case "seat:issue-tracker.changes":
+			if changes {
+				return read("changes.json"), nil
+			}
+			return nil, errors.New("mesh-issues has no tool issue-tracker.changes")
 		case "seat:issue-tracker.get":
 			if a.Number == 1422 || a.Number == 1956 {
 				return read(fmt.Sprintf("get-%d.json", a.Number)), nil
@@ -454,7 +462,7 @@ func sinceWorld(t *testing.T) func(string, any) (json.RawMessage, error) {
 // tracker's notes, links, workers and closes, its milestones' history and mesh-delivery's transitions and checks.
 func TestProgressSinceAWindowSaysOnlyWhatChanged(t *testing.T) {
 	at := func(s string) *time.Time { v, _ := time.Parse(time.RFC3339, s); return &v }
-	k := &KB{Records: progressRecords(), Seats: sinceWorld(t), Now: func() time.Time { return *at("2026-10-28T11:13:30Z") }}
+	k := &KB{Records: progressRecords(), Seats: sinceWorld(t, true), Now: func() time.Time { return *at("2026-10-28T11:13:30Z") }}
 	p, err := k.Progress(ProgressAsk{Of: "issue 1422", Since: "2h"})
 	if err != nil {
 		t.Fatal(err)
@@ -464,7 +472,7 @@ func TestProgressSinceAWindowSaysOnlyWhatChanged(t *testing.T) {
 		t.Fatalf("%d changes, since %q:\n%s", p.Changes, p.Since, p.Tree)
 	}
 	for _, want := range []string{
-		"▶ 1422  " + clip("The catch-up reads the trunk 'main' of repositories the catalogue follows by another branch or by a commit, and the forge holds none", 80) + " — → fixing by fix-trunk-unknown@shanks " + when(at("2026-10-28T09:38:37Z")) +
+		"▶ 1422  " + clip("The catch-up reads the trunk 'main' of repositories the catalogue follows by another branch or by a commit, and the forge holds none", 80) + " — open → fixing by fix-trunk-unknown@shanks " + when(at("2026-10-28T09:38:37Z")) +
 			"; 9 notes, the last " + when(at("2026-10-28T11:05:21Z")) + " by shanks.node-tools",
 		"✓ mesh-catalog#537 (1422)  opened " + when(at("2026-10-28T10:20:56Z")) + " · check pass " + when(at("2026-10-28T10:30:45Z")) + " · merged " + when(at("2026-10-28T10:34:49Z")) + ", on the machines",
 		"✓ mesh-delivery#94 (1126, 1422)  opened ",
@@ -478,16 +486,25 @@ func TestProgressSinceAWindowSaysOnlyWhatChanged(t *testing.T) {
 		t.Errorf("a change outside issue 1422 or the window is said:\n%s", p.Tree)
 	}
 	w := strings.Join(p.Warnings, "\n")
-	for _, want := range []string{"keeps no history of an issue's moves", "keeps no time a merge reached its machines"} {
-		if !strings.Contains(w, want) {
-			t.Errorf("no %q in the warnings: %v", want, p.Warnings)
-		}
+	if !strings.Contains(w, "keeps no time a merge reached its machines") || strings.Contains(w, "issue-tracker.changes") {
+		t.Errorf("the warnings: %v", p.Warnings)
+	}
+	// A tracker that cannot say its moves: each is said by the status it reached, and that is said.
+	old := &KB{Records: progressRecords(), Seats: sinceWorld(t, false), Now: k.Now}
+	o, err := old.Progress(ProgressAsk{Of: "issue 1422", Since: "2h"})
+	if err != nil {
+		t.Fatal(err)
+	}
+	if !strings.Contains(o.Tree, " — → fixing by fix-trunk-unknown@shanks "+when(at("2026-10-28T09:38:37Z"))) || o.Changes != 17 ||
+		!strings.Contains(strings.Join(o.Warnings, "\n"), "issue-tracker.changes: mesh-issues has no tool issue-tracker.changes; a move is said by the status it reached") {
+		t.Errorf("without changes:\n%s\n%v", o.Tree, o.Warnings)
 	}
 	d, err := k.Progress(ProgressAsk{Of: "issue 1422", Since: "2h", Detail: DetailDetailed})
 	if err != nil {
 		t.Fatal(err)
 	}
-	for _, want := range []string{"│   ├── noted " + when(at("2026-10-28T09:38:09Z")) + " by shanks.node-tools: lead-47@shanks 2026-10-28 09:40Z.",
+	for _, want := range []string{"│   ├── open → fixing " + when(at("2026-10-28T09:38:37Z")) + " by shanks.node-tools, worker fix-trunk-unknown@shanks",
+		"│   ├── noted " + when(at("2026-10-28T09:38:09Z")) + " by shanks.node-tools: lead-47@shanks 2026-10-28 09:40Z.",
 		"    └── merged " + when(at("2026-10-28T10:34:49Z")) + ": on the trunk its modules follow: merged there"} {
 		if !strings.Contains(d.Tree, want) {
 			t.Errorf("detailed: no %q in\n%s", want, d.Tree)