feat: first take at M4

crates/bds-core/src/render/mod.rs

@@ -1 +1,20 @@
-// Rendering pipeline — stubs for M0, implemented in M4.
+mod markdown;
+mod generation;
+mod page_renderer;
+mod routes;
+mod template_lookup;
+
+pub use generation::{
+	CalendarArchiveData, GeneratedWriteOutcome, build_calendar_json,
+	build_core_generation_paths, write_generated_file,
+};
+pub use markdown::render_markdown_to_html;
+pub use page_renderer::{RenderError, render_liquid_template};
+pub use routes::{
+	RenderedPage, build_canonical_post_path, render_starter_list_page,
+	render_starter_single_post_page,
+};
+pub use template_lookup::{
+	RenderCategorySettings, RenderTemplateLookup, TemplateLookupError,
+	resolve_post_template,
+};