Automatically check in TPN updates on a regular cadence

@jeskew implemented a process to (almost) automatically check in changes from running dotnet format. It would be great to do the same thing for TPN updates.

Start by locating the existing process @jeskew implemented for automatically checking in dotnet format changes, then compare its workflow with how TPN updates are produced. Done means TPN changes are checked in automatically on a regular cadence, with the cadence and generated updates behaving consistently with the existing process.

Written by the indexing model from the issue text.