Function classify_imperva 

pub fn classify_imperva(
    reese84: &str,
    incap_ses: &str,
    challenge_present: bool,
) -> ImpervaClearance

Pure classifier for Imperva clearance, given the reese84 (ABP) value and the incap_ses_* (classic) value plus whether the _Incapsula_Resource challenge is still present.

Decision (most-authoritative first):

• reese84 long-form ⇒ Valid (modern ABP gate).
• else, classic pass: challenge gone AND incap_ses_* set ⇒ Valid.
• else, any cookie present but not yet qualifying ⇒ Pending.
• else ⇒ Missing.

visid_incap is deliberately NOT a pass signal, it is assigned on first visit before the challenge is solved, so trusting it would report a pass that never happened.

Examples

use captchaforge::solver::vendors::imperva::{classify_imperva, ImpervaClearance};

// Modern ABP: a long reese84 token is a pass regardless of challenge state.
let reese = "A1b2C3d4".repeat(20);
assert_eq!(classify_imperva(&reese, "", true), ImpervaClearance::Valid);
// Classic: challenge gone + a real incap_ses ⇒ pass.
assert_eq!(classify_imperva("", "Tfje92kfASDFkjasdf9012", false), ImpervaClearance::Valid);
// Classic: incap_ses set but challenge STILL present ⇒ not yet.
assert_eq!(classify_imperva("", "Tfje92kfASDFkjasdf9012", true), ImpervaClearance::Pending);
// Nothing ⇒ missing.
assert_eq!(classify_imperva("", "", true), ImpervaClearance::Missing);