The indexer hands coverage extractors an OS-native relative path on
purpose: graphRelKey keeps backslashes on Windows so an incremental
re-index's evict lookup matches the keys the cold walk wrote.
IsMigrationPath matched '/'-separated segments only, so on Windows no
nested migration file was recognised — migration ingest never ran, the
canonical table / column / migration nodes were never emitted, and
unreferenced_tables reported zero because nothing had a provider.
Fold separators before matching.
Andrey Kumanyaev
cb6b21ed97