PII round-trip: AiGuard auto-rehydrates redacted placeholders in LLM
output. Numbered placeholders ([EMAIL_1], [EMAIL_2]) replace shared
[EMAIL]. ScanResult.redactionMap exposes token→original for any scanner.
GuardOutcome gains rawOutput + piiMap.

RepetitionScanner: word-level n-gram frequency detector for degenerate
model output. Configurable ngramSize + threshold, output-stage only.