Drop the boolean implemented/not-implemented state in favor of a
mandatory CMMI maturity level enum (NONE, INITIAL, MANAGED, DEFINED,
QUANTITATIVELY_MANAGED, OPTIMIZING) stored as a Postgres enum type.
The migration backfills existing rows (NOT_IMPLEMENTED → NONE,
IMPLEMENTED → INITIAL), makes the column NOT NULL, and drops the old
implemented column and its enum type.
- maturityLevel is required on CreateControlInput and non-nullable (!)
in the GraphQL schema
- CLI displays human-readable CMMI labels instead of raw enum tokens
- SOA table and published document use a single Maturity column in
place of the old Implemented + Maturity columns
- Remove ControlImplementationState type and all implemented references
across backend, frontend, CLI, MCP, n8n, and E2E tests
Signed-off-by: Sacha Al Himdani <sacha@getprobo.com>