Split ws from jobsearch as a separate test utility rather than a feature of jobsearch

cmd/jobsearch/main_test.go

@@ -18,7 +18,7 @@ func TestCommandTree(t *testing.T) {
 		names = append(names, c.Name())
 	}
 
-	commands := []string{"config", "fetch", "migrate", "version", "ws"}
+	commands := []string{"config", "fetch", "migrate", "serve", "version"}
 	for _, want := range commands {
 		if !slices.Contains(names, want) {
 			t.Errorf("job-search has no %q command; has %v", want, names)