bayes for days

docs(harness): the stalling scenario fields artillery contrary to intent master

Noted, not changed: `vehicles` is already measured against this suite, so altering it would make a future run non-comparable. Removing the scenario is a between-rounds decision. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Change-Id: I0ea3778c48dc43d0b25ca22afa5ee0b8725b5427