merge

type Document struct {
	Preamble string    // Content before the first H2
	Sections []Section // H2-delimited sections
}

type Layer struct {
	Content string
	Source  string // "team" | "personal" | "project"
}

type MergeOptions struct {
	AnnotateSources bool                                // Add source comments
	TeamRepo        string                              // For header annotation (e.g., "acme/standards")
	Languages       []string                            // Active languages to include
	LanguageFiles   map[string][]*language.LanguageFile // Language files by language ID
}

type Section struct {
	Header  string // The H2 header text (without ##)
	Content string // Everything until the next H2
}