feat(learner): library, search, course outline with gating, lesson payload API

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

packages/feature-learner/test/courses.ts

@@ -0,0 +1,48 @@
+import { mkdtempSync } from "node:fs";
+import { tmpdir } from "node:os";
+import { join } from "node:path";
+
+/** Writes extra test courses to a temp dir: a restricted one and a gated one with a deck on a module. */
+export async function extraCourses(): Promise<string> {
+  const dir = mkdtempSync(join(tmpdir(), "stc-courses-"));
+  await Bun.write(join(dir, "secret/stcourse.yaml"), `schema: 1
+id: secret
+title: Secret course
+visibility: restricted
+collections: [DevOps]
+modules:
+  - id: m1
+    title: Only module
+    lessons:
+      - { id: s1, title: Hidden lesson, type: text, file: a.md }
+`);
+  await Bun.write(join(dir, "secret/a.md"), "# Hidden\n\nwords here");
+  await Bun.write(join(dir, "gated/stcourse.yaml"), `schema: 1
+id: gated
+title: Gated course
+pitch: Learn things in order
+visibility: signed-in
+gating: sequential
+collections: [DevOps, Functional programming]
+decks:
+  - { id: dk, file: "Æble slides/deck one.pdf", title: Deck one, attachTo: g2 }
+attachments:
+  - { file: "Æble slides/cheat sheet.pdf", title: Cheat sheet, module: g1 }
+modules:
+  - id: g1
+    title: First
+    lessons:
+      - { id: g1a, title: Start here, type: text, file: "lessons/one.md" }
+      - { id: g1b, title: Then this, type: text, file: "lessons/two.md" }
+  - id: g2
+    title: Second
+    lessons:
+      - { id: g2a, title: Locked lesson, type: text, file: "lessons/three.md" }
+`);
+  await Bun.write(join(dir, "gated/lessons/one.md"), "# One\n\nSee [two](two.md).\n");
+  await Bun.write(join(dir, "gated/lessons/two.md"), "# Two\n");
+  await Bun.write(join(dir, "gated/lessons/three.md"), "# Three\n\nsecret content");
+  await Bun.write(join(dir, "gated/Æble slides/deck one.pdf"), "%PDF-1.4\n");
+  await Bun.write(join(dir, "gated/Æble slides/cheat sheet.pdf"), "%PDF-1.4\ncheat");
+  return dir;
+}