Two bugs found while filing the Obsidian Sorter note itself:
1. proposed_toc went stale when proposed_folder was edited by hand.
The watcher now re-resolves the index line from the folder on every pass.
2. Re-proposing after a body edit clobbered a hand-edited proposed_folder.
The watcher's own suggestion is now kept separately in
proposed_folder_auto, so a difference marks a human choice, which wins.
Adds two guard tests. 17/17 passing.
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