манифест набора переименован в .conventions-suite.toml

- оба манифеста стали данными, которые инструмент переписывает целиком,
  так что и наборный получает точку в начале: он служебный файл, а не
  документ репозитория
- переименование механическое, одна константа manifest.Name; литералы в
  фикстурах и ссылки в README.md и CLAUDE.md обновлены следом

internal/cli/cli_test.go

@@ -127,7 +127,7 @@ func TestAddInInteractiveMode(t *testing.T) {
 			t.Errorf("the file lost %q:\n%s", want, body)
 		}
 	}
-	if !strings.Contains(read(t, root, "suite.toml"), `logging = "логирование: уровни"`) {
+	if !strings.Contains(read(t, root, ".conventions-suite.toml"), `logging = "логирование: уровни"`) {
 		t.Error("the topic did not reach the manifest")
 	}
 	checkClean(t, root)

internal/cli/retire_test.go

@@ -144,7 +144,7 @@ func TestRetirePrefixMovesTheNameAndTakesTheFile(t *testing.T) {
 		t.Error("the file stayed behind")
 	}
 
-	toml := read(t, root, "suite.toml")
+	toml := read(t, root, ".conventions-suite.toml")
 	if strings.Contains(toml, `SLOG = "conventions/logging.md"`) {
 		t.Errorf("the prefix stayed in the live half:\n%s", toml)
 	}
@@ -179,7 +179,7 @@ func TestRetireTopicWaitsForItsLayers(t *testing.T) {
 		t.Fatalf("retiring an empty topic returned %d: %s", code, out)
 	}
 
-	toml := read(t, root, "suite.toml")
+	toml := read(t, root, ".conventions-suite.toml")
 	if strings.Contains(toml, `time = "время"`) {
 		t.Errorf("the topic stayed in the live half:\n%s", toml)
 	}

internal/cli/suiteinit.go

@@ -28,7 +28,7 @@ particular suite is for and how it is kept.
 
 ## The manifest
 
-` + "`suite.toml`" + ` holds the identity of the suite: the language its rules are
+` + "`.conventions-suite.toml`" + ` holds the identity of the suite: the language its rules are
 written in, its topics and its rule prefixes. It is written by ` + "`convy`" + ` and
 carries no comments — a command rewrites the whole file, and a comment would not
 survive that. Explanations belong here instead.