Function compute_content_fingerprint 

pub fn compute_content_fingerprint(content: &str) -> Fingerprint

Compute content fingerprint for deduplication using blake3

This uses ReCoco’s Fingerprinter which provides:

• 10-100x faster hashing than SHA256 via blake3
• 16-byte compact fingerprint (vs 32-byte SHA256)
• Automatic integration with ReCoco’s memoization system
• Type-safe content-addressed caching