PR Template - Sprint 18 Task 06

Task

Enumerate cross-tenant escalation scenarios.

Summary

• Added STRIDE scenarios for tenant boundary bypass and shared-resource abuse (S4/T4/R4/I4/D4/E4).

Scope

• docs/THREAT_MODEL.md

Validation

• PYTHONPATH=src .venv/bin/pytest -q tests/qa/test_sprint18_threat_model_qa.py

Checklist

• Cross-tenant scenarios documented
• Tenant isolation risks explicit
• Merged into dev