Function load_from_file 

pub fn load_from_file<Id>(path: &Path) -> Result<FibSidecarIndex<Id>>
where
    Id: Clone + Eq + Debug + DeserializeOwned,

Load a FibSidecarIndex from a binary file (fully owned).

Reads the file, reconstructs the FibScorer from the profile (by rebuilding the quantizer), and decodes each entry’s compact bytes into a FibCodeV1.

The Id type must implement DeserializeOwned (via postcard).

Errors

Returns FibQuantError::CorruptPayload for malformed files or deserialization failures.