Function memory_adjustment_for 

pub fn memory_adjustment_for(memory: &ChallengeMemory, key: &EngineKey) -> f64

Compute the risk-score adjustment a ChallengeMemory would apply for an EngineKey, using the ChallengeFeedbackPolicy::default clamp.

Returns 0.0 when the memory has no entry for the key (the common case on first contact with a new target).

Example

use stygian_charon::challenge_feedback::{
    memory_adjustment_for, ChallengeMemory, ChallengeOutcome, EngineKey,
};
use stygian_charon::types::TargetClass;
use stygian_charon::vendor_classifier::VendorId;

let memory = ChallengeMemory::with_defaults();
let key = EngineKey {
    engine: VendorId::Cloudflare,
    version: None,
    target_class: TargetClass::ContentSite,
    tls_profile: None,
};
memory.record(&key, None, ChallengeOutcome::Captcha);
let delta = memory_adjustment_for(&memory, &key);
assert!(delta > 0.0);