P2: write analyst workflow SOP document

[yohei1126]

Context

Annex A includes an "operational scenario" narrative but no formal Standard Operating Procedure (SOP) for how analysts and patrol officers use arktrace day-to-day. Cap Vista will need this for analyst onboarding.

Required

Prepare a 2–3 page SOP document covering:

1. Alert receipt — watchlist update cadence, thresholds, notification channels (SSE, email)
2. Review tiers — Confirmed ≥0.7, Probable 0.5–0.7, Suspect <0.5, Cleared, Inconclusive
3. Evidence review checklist — SHAP signals, causal ATT, ownership chain, last 10 AIS positions, GDELT context
4. Dispatch decision — sign-off authority, decision record, brief generation
5. Feedback loop — patrol outcome recording, manual label input, model recalibration trigger

Deliver as _outputs/arktrace-sop.pdf and include in Week 7 trial report deliverables.

Acceptance criteria

• _outputs/arktrace-sop.pdf exists (or docs/sop.md at minimum)
• SOP is referenced in Annex A Week 7 deliverables list