RAAML12 — Weakness is not stereotyped as Weakness, and is not marked as Abstract and must be made abstract for consistency

The issue is that Weakness is not currently stereotyped as Weakness, and is not marked as Abstract, which puts it out of alignment with the other RAAML library elements. To resolve this, the ticket calls for stereotyping it as Weakness and marking it as abstract. This change should help ensure consistency with Factors and Limitations in the STPA Loss Scenario.