test: sample fixture course

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

fixtures/courses/sample/stcourse.yaml

@@ -0,0 +1,35 @@
+schema: 1
+id: sample
+title: Sample course
+pitch: A tiny self-contained course used by the test suite.
+visibility: public
+tracks:
+  - { id: js, label: JavaScript }
+mentor: MENTOR.md
+source: { kind: authored }
+decks:
+  - { id: d1, file: media/deck.pdf, attachTo: m1-video }
+modules:
+  - id: m1
+    title: First steps
+    code: { dir: "code/S01 - First steps", command: "sh hello.sh" }
+    lessons:
+      - { id: m1-intro, title: Introduction, type: text, file: lessons/01-intro.md }
+      - { id: m1-video, title: Watch the clip, type: video, file: media/clip.mp4, duration: 2, transcript: lessons/02-video.md }
+      - { id: m1-code, title: Code along, type: text, file: lessons/03-code.md }
+  - id: m2
+    title: Exercises
+    lessons:
+      - { id: m2-text, title: Adding numbers, type: text, file: lessons/04-exercise.md }
+      - id: m2-ex-add
+        title: "Exercise 2.1: add"
+        type: exercise
+        file: lessons/04-exercise.md
+        anchor: exercise-21--add
+        hints: { file: lessons/04-exercise.md, match: "Exercise 2.1 (add)" }
+        browser:
+          language: js
+          starter: exercises/add/starter.js
+          tests: exercises/add/tests.js
+          solution: exercises/add/solution.js
+        localCommand: "node --test"