Name the tool schemas of the prompt

The function tools that every model call sends are promptTools, and
their schema helpers start with prompt too. The turns and the
compactions send the same prompt and tools, so the tools are a part of
the prompt, and agentTools read as the tools of an agent next to the
agent config. The parts of the prompt text, such as the task sentence
and the clause on the instructions, start with prompt as well.

The declarations of prompt.go already follow the order of the go-code
skill. The behavior does not change.

Issue: 947bddb