A stopped tool drops its membership handler and a stopped bundle starts no copy on a call, so a replaced bundle's old tools stay gone (issue 1945, review round 2)

Its events are refused before the old bundle stops, the bundle watch follows a directory made between
its stat and its watch, and a bundle's reason is read without node's colour codes.

node-tools/internal/runtime/watch.go

@@ -61,26 +61,40 @@ func watchBundles(paths []string, changed func(), logf func(string, ...any)) (fu
 }
 
 // arm watches, for every entrypoint, its directory, or the nearest directory above it that exists. A
-// watch already held on the same directory is kept (inotify answers its descriptor again).
+// watch already held on the same directory is kept (inotify answers its descriptor again). A directory
+// made below the watched one between its stat and its watch would be heard by nobody, so after each watch
+// the path is looked at again, and a deeper directory that came to be is watched in turn.
 func (w *bundleWatch) arm() {
 	for _, p := range w.paths {
-		dir := filepath.Dir(p)
+		target := filepath.Dir(p)
+		watched := ""
 		for {
-			if info, err := os.Stat(dir); err == nil && info.IsDir() {
+			dir := nearestDir(target)
+			if dir == watched {
 				break
 			}
-			up := filepath.Dir(dir)
-			if up == dir {
+			wd, err := unix.InotifyAddWatch(w.fd, dir, watchMask)
+			if err != nil {
+				w.logf("[mesh-tools] cannot watch %s for %s's bundle: %v; a bundle placed or changed there is served only after a restart", dir, p, err)
 				break
 			}
-			dir = up
+			w.byWD[wd] = dir
+			watched = dir
 		}
-		wd, err := unix.InotifyAddWatch(w.fd, dir, watchMask)
-		if err != nil {
-			w.logf("[mesh-tools] cannot watch %s for %s's bundle: %v; a bundle placed or changed there is served only after a restart", dir, p, err)
-			continue
+	}
+}
+
+// nearestDir is dir when it is a directory, else the nearest directory above it.
+func nearestDir(dir string) string {
+	for {
+		if info, err := os.Stat(dir); err == nil && info.IsDir() {
+			return dir
 		}
-		w.byWD[wd] = dir
+		up := filepath.Dir(dir)
+		if up == dir {
+			return dir
+		}
+		dir = up
 	}
 }