Remove completed todo.md + html-css-foundation mockups; strip dead §N phase refs from comments/docs (simplify visual E2E to drop the mockup-comparison oracle)

src/context.test.ts

@@ -46,7 +46,7 @@ test("buildContext defaults a missing request URL to /", () => {
   assert.equal(buildContext(req, res).url.pathname, "/");
 });
 
-test("buildContext provides a logger: a silent default, or the host's request logger (§9)", () => {
+test("buildContext provides a logger: a silent default, or the host's request logger", () => {
   const { req, res } = reqRes("/");
   assert.equal(typeof buildContext(req, res).log.info, "function"); // always present (silent default)
   const log = createLogger({ level: "none" });