SessionAudit.qml — tamper-evident JSONL log of all session state changes:
- Lock/unlock, secure/insecure transitions
- Idle state machine transitions (active/dimmed/lock/sleep/wake)
- PrepareForSleep, external lock signals, inhibitor lifecycle
- Step-up auth success/failure, break-glass issued/consumed/expired
- Grant expiry and revocation
Hash chain: each entry includes md5 of previous entry. Sequence numbers
detect gaps. Chain is validated on startup from the last entry.
Uses Qt.md5() (not SHA256 — not available in QML). Advisory tamper-
evidence, not cryptographic security. Log at:
~/.local/share/souveraine/session-audit.jsonl