Save makes the directories its file goes in, always: for the pane's own name and Save path alike

Whether a Save made missing directories depended on how the name had
come about. Config's pane did, a name written into a missing directory did
(since kkrqxtsp), and `Save path` and every other name did not, failing
ENOENT instead. There is now one rule: a Save makes the parent
directories of the file it writes, a pane's own or a terminal's
scrollback included, and the make_dirs flag is gone. A directory it
cannot make still fails the write with why, as fs.py's
/nonexistent-pardes-dir case shows. fs.py now also saves into missing
directories by Save path and by a written name.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

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