Regulated industries mode — AS9100, ISO 13485, hash-chained sign-off

Regulated mode (Manufacturing → Settings → Regulated industries) flips on tamper-evident sign-offs and audit-grade reporting. Recommended for any org targeting AS9100, ISO 13485, FDA 21 CFR Part 11, or DoD second-source production.

What changes when regulated mode is on:
• Every station sign-off captures a hash chain — the new step's hash is computed from (step content + prior step's hash). If anyone alters a step retroactively, every later step's hash breaks; the audit report flags the discrepancy.
• Sign-offs require a re-authentication challenge (TOTP / passkey) per the FDA 21 CFR Part 11 "electronic signature" requirement. A casual click is not a valid signature; an authenticated act of consent is.
• Travelers cannot be deleted — only superseded by a new revision with an audit trail.
• First Article Inspection (FAI) reports are auto-generated for the first unit of each new BOM revision.
• The Audit Report PDF (Manufacturing → Settings → Generate audit report) bundles every traveler, sign-off, and material certification for a given date range or production order set into a single time-stamped, hash-linked PDF — ready to hand an auditor.

What does NOT change:
• Day-to-day floor flow — operators still scan, capture fields, sign off. The hash chain is computed in the background.
• Performance — sign-offs remain sub-second.
• Backwards compat — non-regulated travelers from before the flip stay as-is; only travelers created after enabling regulated mode get the chain.

Compliance scope:
Regulated mode gives you the technical foundation for AS9100 / ISO 13485 / 21 CFR Part 11 conformance — it does not by itself certify your operation. Certification is a process of audits, documented quality systems, and corrective-action records. Turtini provides the records; the certification is yours to drive.