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

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