Expose Markdown validation selection

cmd/releasekit/internal/cli/config.go

@@ -130,12 +130,20 @@ type ValidationSettings struct {
 	// GoFormat checks the formatting of committed regular Go source files.
 	// Omitted or false disables the check.
 	GoFormat           bool                       `json:"go_format,omitempty"`
+	Markdown           *MarkdownSettings          `json:"markdown,omitempty"`
 	ModuleDistribution ModuleDistributionSettings `json:"module_distribution,omitempty"`
 	// FileSize checks the size of each committed blob. Null or omission disables
 	// the check; an empty object enables the default limit.
 	FileSize *FileSizeSettings `json:"file_size,omitempty"`
 }
 
+// MarkdownSettings selects committed Markdown destination and fragment checks.
+type MarkdownSettings struct {
+	// EnforceCheckoutBoundary fails local destinations that resolve outside
+	// the candidate checkout. Submodule contents remain out of scope.
+	EnforceCheckoutBoundary bool `json:"enforce_checkout_boundary,omitempty"`
+}
+
 // FileSizeSettings selects the maximum committed-file size and literal exclusions.
 type FileSizeSettings struct {
 	LimitBytes *int64   `json:"limit_bytes,omitempty"`