Observability ideas

[Zac-HD]

The current dashboard is a good start, but there's plenty of room for improvement.

• Cuumulative and per-input coverage reports like :command:coverage html
• Compare branch-hit frequency between blackbox and mutational modes, to assist in designing strategies (see this blog post).
• Abstracting away inputs like e.g. https://github.com/gamozolabs/cookie_dough
• Improved time-travel debugging (see eg this comment)