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/manifest/manifest.go

@@ -30,9 +30,11 @@ import (
 )
 
 // Name is the name of a suite manifest. Which of the two manifests lies next
-// to you tells you where you are: suite.toml means a suite, .conventions.toml
-// means a project.
-const Name = "suite.toml"
+// to you tells you where you are, and both start with a dot for the same
+// reason: a manifest is data the tool writes, not a document of the repository,
+// and it sits with the rest of the service files rather than among the
+// conventions themselves.
+const Name = ".conventions-suite.toml"
 
 // DefaultLanguageCode is the suite's natural language when the manifest says
 // nothing about it. The key is optional on purpose: the vocabulary lives in the
@@ -83,7 +85,7 @@ func (s *Section) Retire(key, note string) {
 	s.Retired[key] = note
 }
 
-// Manifest is a parsed suite.toml.
+// Manifest is a parsed suite manifest.
 type Manifest struct {
 	Language Language `toml:"language"`
 	Topics   Section  `toml:"topics,omitempty"`