Codemm v1.0.0-beta.9

Unsigned beta installers for macOS and Windows. Each needs one Open Anyway step (docs/desktop/beta-plan.md).

• Choose how you practise. A new course can have coding activities, quizzes or lessons only, so a topic you can't practise with code, such as design or theory, still gets a course. Activities can be switched on or off later from the course, and your progress is kept either way.
• Quizzes. Your agent writes multiple-choice quizzes from the lesson. Each quiz counts once, its answers stay inside Codemm until you check, and a topic you're stuck on gets a fresh quiz after you reread its lesson.
• Roadmaps grounded in their sources. Research records what each topic should practise and the usual mistakes, with the sources it read. Then your agent reviews the roadmap against those sources before you see it. A failed review never holds you up.
• Activities aimed at what you missed. The next activity's writer knows which of your tests failed last time. Hidden tests are passed on only by number, never by content.