Code execution is organized into three tiers consisting of subprocess for Tier 1, Docker container for Tier 2, and Firecracker VM for Tier 3 so that execution isolation can vary by tier.

Three-tier execution:

— PYRANA_PLATFORM_ARCHITECTURE_REFERENCE.md

subprocess (Tier 1)

— PYRANA_PLATFORM_ARCHITECTURE_REFERENCE.md

Docker container (Tier 2)

— PYRANA_PLATFORM_ARCHITECTURE_REFERENCE.md

Firecracker VM (Tier 3)

— PYRANA_PLATFORM_ARCHITECTURE_REFERENCE.md