Remove a file path from the cache.
The file path (will be normalized).
Get the content hash for a file path.
The file path (will be normalized).
The content hash, or undefined if not cached.
Reverse lookup: get all file paths with a given content hash.
The content hash to look up.
Array of normalized file paths with that hash.
Store or update the content hash for a file path.
The file path (will be normalized).
The SHA-256 content hash.
In-memory content hash cache for move detection.
Maps normalized file paths to SHA-256 content hashes. Supports reverse lookup (hash → paths) for correlating unlink+add events as file moves.