Adds an optional CMMI 0-5 maturity level field to Control to support
ISO 27001 clause 9.1 effectiveness measurement and HITRUST CSF maturity
requirements. The field is nullable, framework-agnostic, and exposed
across all four API surfaces (GraphQL, MCP, CLI, n8n) plus the
generated SoA document.
Signed-off-by: Alejandro Juan <alejandrojuan@alejandrojuan.com>
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