3df7fda26a
Lay groundwork for user-editable templates by adding Tera as a runtime template engine alongside the existing maud templates. Changes: - Add tera dependency - Create TemplateEngine struct with render methods - Add TemplateLoad/TemplateRender error variants - Add section_type/template fields to Frontmatter - Create templates/ directory with base, page, section, and content templates Dead code warnings are expected; TemplateEngine will be wired in to replace maud in subsequent commits.