canonical

type CommitContent struct {
	Message   string
	AuthorID  string
	CreatedAt int64    // Unix ms, set by the client at commit time
	Parents   [][]byte // 32-byte raw hashes in order (first parent, second for merge); NOT sorted
	Files     []CommitFile
}

type CommitFile struct {
	Path       string
	ObjectHash []byte // nil for a deletion
}

type RequestContent struct {
	PrincipalID   string
	Method        string // uppercase ASCII: "GET", "POST", …
	RequestTarget string // endpoint path + query string, exactly as sent
	Timestamp     int64  // Unix ms
	BodySHA256    []byte // 32 raw bytes; SHA-256 of empty body if none
}