A request body also carries the session log, whose recorded title event
embeds the framed prompt, so a body-wide marker search matches the main
request too; both mocks now read the request's own messages. The headless
scenarios also assert the dispatched cap, which is the base-bundle ceiling
on the 256000-token route and the route override's 1024 in the pi-ai
compatibility scenario. The extraction cases cover asterisks that are not
emphasis.