Save path logs a save record naming the path it wrote

Save of a pane's own file logged `save <serial> <name>`, and so did a
scratch's `Save path` (the pane takes that name). A `Save path` that
writes a copy of a file pane, or a terminal's scrollback, elsewhere
logged nothing, so a follower could not tell the file was written. It
now logs `save <serial> <path>` with the path written, once the host has
written it (events.noteLogAs). fs.md's log table says so.

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

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