pf-ethnographer/sanitizer

Redaction-only subagent for pf-ethnographer. Accepts raw observed behavior and interpretation reports from the Ethnographer, applies aggressive PII and sensitive-data redaction using regex detectors, heuristics, and secret-scanning patterns, and returns sanitized reports plus a full redaction manifest. Never invoked directly by the user or by the model — only spawned by the Ethnographer during a research pulse.