Files directly in YYMMDD/ (e.g. 231015/take1.wav, 231015/take2.wav) all
shared the same nc_folder_path, so take2 was silently merged as a new
version of the take1 song instead of being a separate recording.
Fix: when a file's parent == the session folder, append the file stem
to make a unique virtual nc_folder_path per file. Files in subfolders
(e.g. 231015/groove/take1.wav) are unaffected — they still group by folder.
Applied in both nc_scan.py (manual scan) and internal.py (watcher uploads).
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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