When Kisani's manifest has 0–1 entries but the NAS directory contains thousands of
files uploaded by other tools, reconcile previously showed Already Safe = 1 because
countSafe only matched against the tiny manifest.
The validity check in buildManifestIndex now:
- Stores the filtered NAS filenames in NASManifestCache (directoryFilenames field)
- Returns a ManifestIndex(nasListing:) for filename-based matching against all NAS files
The fast-path reconcile now:
- Detects a sparse manifest (entries ≤ 1, dirCount > 1)
- Rebuilds ManifestIndex(nasFilenames:) from the cached filenames for O(1) filename matching
- Falls back to full NAS reconcile if cached filenames aren't available yet
Adds ManifestIndex.init(nasFilenames:) for fast-path reconstruction from cached strings.
Co-Authored-By: Kutesir <kutesir@provoc.ug>
Co-Authored-By: Sentry <sentry@provoc.ug>
2384a74517