OSCAL POA&M Schema

The OSCAL POA&M schema (src/oscal/schema/oscal_poam.yaml) encodes the OSCAL Plan of Action and Milestones (POA&M) model: a document that tracks identified risks, weaknesses, and deficiencies in a system along with milestones for remediation.

Upstream documentation: - https://pages.nist.gov/OSCAL/learn/concepts/layer/assessment/poam/