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Sprint 35 Engineering Log

Program Context

Phase: Phase 10
Sprint: Sprint 35
Status: Completed
Primary Architecture Layers: Runner identity, attestation, key lifecycle

Architectural Intent

Extend hardware-assisted isolation with TPM-backed identity contracts, per-execution ephemeral key derivation, and runner-control-plane mutual attestation.

Implementation Detail

Implemented scope:

Added Sprint 35 attestation contracts (src/pkg/runner/attestation.py)
Added TPM identity evidence provider (simulation-safe contract)
Added per-execution ephemeral key derivation using execution context binding
Added mutual attestation service for runner-control-plane session binding
Added multi-tenant isolation stress validator for binding-collision checks
Integrated mutual attestation + ephemeral key metadata into firecracker execution telemetry (src/pkg/runner/universal.py)
Added unit tests and QA checks for Sprint 35 artifacts

Security and Control Posture

Zero-trust delegation and execution fingerprint architecture remain intact.
Firecracker execution path now includes additional identity and session-binding metadata.
Mutual attestation failures fail closed at execution boundary.

QA and Validation Evidence

Validation evidence:

pytest tests/unit/test_runner_attestation.py
pytest tests/unit/test_universal_edge_runner.py
pytest tests/qa/test_sprint35_mutual_attestation_qa.py

Risk Register

Primary risk is simulation/native attestation parity gap for on-prem TPM environments. Mitigation:

deterministic contracts in simulation mode
strict fail-closed mutual attestation checks
explicit future extension path for real TPM quote verification providers

Forward Linkage

Phase 10 closure continues with operational hardening and native host deployment runbooks.

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