splitting ctx.linearize() into two more fitting functions:

[HendrikStrobelt]

1. ctx.render_for_generation() used in generate calls 2) ctx.full_event_log() used for views on the whole context

also: fixed and inherent bug in m.chat which wrongly added the chat turn to the contexts (as single events, not as turn).

[nrfulton]

also: fixed and inherent bug in m.chat which wrongly added the chat turn to the contexts (as single events, not as turn).

I want to revisit this.

My understand was that:

m.insert(instruction)
m.insert(modeloutputthunk)
m.ctx.last_turn()

should be the same as:

m.insert_turn(Turn(instruction, modeloutputthunk))
m.ctx.last_turn()