fix: final review findings

Co-Authored-By: Claude Opus 5.5 <[email protected]>

README.md

@@ -44,9 +44,9 @@ To play the game in any track you also need a modern browser. [Module 0](course/
 Run the tests (from the repository root):
 
 ```sh
-cd js && node --test "test/m03-*.test.js"   # JavaScript, one module   (all: ./test.sh)
-cd scala && ./test.sh M03                     # Scala, one module        (all: ./test.sh)
-cd fsharp && ./test.sh M03                    # F#, one module           (all: ./test.sh)
+(cd js && node --test "test/m03-*.test.js")   # JavaScript, one module   (all: ./test.sh)
+(cd scala && ./test.sh M03)                   # Scala, one module        (all: ./test.sh)
+(cd fsharp && ./test.sh M03)                  # F#, one module           (all: ./test.sh)
 ```
 
 In a fresh checkout, Module 0's tests pass and every other module's tests fail: the files in `src/` are stubs for you to fill in.