Sprint 34 Engineering Log

Program Context

• Phase: Phase 10
• Sprint: Sprint 34
• Status: Completed
• Primary Architecture Layers: Runner isolation, execution trust boundary

Architectural Intent

Transition the Universal Runner to a Firecracker-capable microVM backend with explicit hardware-isolation checks and runtime attestation reporting.

Implementation Detail

Implemented scope:

• Added Firecracker runtime module (src/pkg/runner/firecracker.py)
• Added simulation/native launch modes to support development without host-level Firecracker installation
• Added hardware isolation boundary checks (binary availability, KVM presence policy, seccomp hardening, jailer posture)
• Added microVM runtime attestation report generation bound to execution context
• Integrated Firecracker backend into universal runner execution path (src/pkg/runner/universal.py)
• Added breakout-attempt simulation detection and rejection
• Added unit and QA coverage for Sprint 34 artifacts and behavior

Security and Control Posture

• Phase 4+ policy-driven execution path preserved
• Unified execution fingerprint and ledger pipeline preserved
• Zero-trust OPA and federation trust model unchanged
• Firecracker path enforces fail-closed isolation checks in native mode

QA and Validation Evidence

Validation evidence:

• pytest tests/unit/test_firecracker_microvm_runner.py
• pytest tests/unit/test_universal_edge_runner.py
• pytest tests/qa/test_sprint34_microvm_transition_qa.py

Risk Register

Primary risk is operational mismatch between simulated and native firecracker environments. Mitigation:

• simulation mode default for deterministic CI/dev behavior
• explicit native-mode precondition checks
• dedicated runbook for host preparation and E2E validation

Forward Linkage

Sprint 35 extends the trust envelope with TPM-backed identity, per-execution ephemeral key derivation, and mutual attestation.