Function load_session_raw_data 

pub fn load_session_raw_data(
    session_dir: &Path,
) -> Result<HashMap<String, Vec<u8>>, Error>

Load raw entropy data from a recorded session, grouped by source.

Reads raw.bin and raw_index.csv from session_dir, then groups the raw bytes by source name using the index entries.

CSV format (raw_index.csv)

offset,length,timestamp_ns,source
0,1000,1709234567890123456,clock_jitter
1000,1000,1709234567890234567,thermal_noise

Each row after the header contains four comma-separated fields:

• offset — byte offset into raw.bin
• length — number of bytes for this entry
• timestamp_ns — nanosecond timestamp when the sample was recorded
• source — name of the entropy source

Index entries where offset + length exceeds the size of raw.bin are silently skipped (bounds check).

Errors

Returns std::io::ErrorKind::NotFound if either raw.bin or raw_index.csv is missing from session_dir.