Render captured prompt templates without reloading sources

internal/prompt/template.go

@@ -2,6 +2,18 @@ package prompt
 
 import "text/template"
 
+// CompiledTemplates is the immutable parsed template set for one captured
+// prompt. Callers must not mutate its templates after handing it to a renderer.
+type CompiledTemplates struct {
+	Session  *template.Template
+	Messages []*template.Template
+}
+
+// TemplateLookup provides parsed templates for a captured prompt identity.
+type TemplateLookup interface {
+	GetCompiledTemplates(id, version string) (CompiledTemplates, bool)
+}
+
 // CompileTemplate checks static syntax with the same grammar and function
 // names as rendering, without evaluating request inputs or variables.
 func CompileTemplate(name, raw string) (*template.Template, error) {