spec: Add to pt-spec.txt control messages going back to main process (tor)
As part of #28180 (moved), we want to have a PT to report back events, mainly connection to the bridge events for now, to the parent process which is tor in our case.
This ticket is for adding those to pt-spec.txt.
We'll concentrate on connection messages reporting the status of a connection to a Bridge at first to narrow down a bit this work.
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