provideNewChatSessionItem doesn't get a real ChatRequest

[roblourens]

I'm missing a couple things from this

• toolInvocationToken so I can use a confirmation tool
• references so I can handle file attachments

[joshspicer]

Agreed this is a gap

[roblourens]

Sent #264089, but then realized that the agent missed createWithChatSessions and I don't know what to do there.