Function load_cache_partial 

pub fn load_cache_partial(
    path: &PathBuf,
    current_signature: &[String],
    exact_match_only: bool,
) -> Option<Vec<SandboxInfo>>

What: Load cached sandbox data with partial matching support.

Inputs:

• path: Filesystem location of the serialized SandboxCache JSON.
• current_signature: Signature derived from the current install list for validation.
• exact_match_only: If true, only match when signatures are identical. If false, allow partial matching.

Output:

• Some(Vec<SandboxInfo>) when the cache exists and matches (exact or partial); None otherwise.

Details:

• If exact_match_only is false, loads entries for packages that exist in both the cached signature and the current signature (intersection matching).
• This allows preserving sandbox data when packages are added to the install list.