Temp files should go to $TMP instead of TempTypeSpecFiles

Why are we create directories named `TempTypeSpecFiles` in the project workspace? This may be in the workspace root or other directories depending on the CWD, it seems. Why aren't we putting them in `$TMP`? If these are incremental, a common solution is to hash the CWD path (case-sensitive for linux, mac; case-insensitive for Windows) as part of the directory name or under the directory.

Sure, we can `.gitignore` "TempTypeSpecFiles" but grep'ing for source or some LSPs that parse files just get more inundated with cruft. It also no doubt creates problem, if incremental, when switching branches (though, I suppose only including the CWD hash would do so, so maybe the branch name should be considered from `git branch --show-current`).

Start by locating the code that creates directories named TempTypeSpecFiles and inspect how it chooses the directory from the current working directory. Confirm whether the files are incremental, then determine how temporary storage should avoid workspace cruft while preserving the required behavior across operating systems; done means these directories no longer appear in project workspaces.

Written by the indexing model from the issue text.