Allow creation of new records in a scenario

Currently, roadmap planning scenarios only allow modeling changes to existing records (adjusting dates, dependencies, moving records between releases). You cannot create brand new records within a scenario to explore "what-if" questions like "what happens if we add this new initiative/feature to our roadmap?" This limits the usefulness of scenarios for exploratory capacity and resource planning.

Teams want to use scenarios to model whether they have capacity to take on new work, not just reschedule existing work. Without the ability to add hypothetical new records, teams must create "real" records in their workspace just to explore possibilities, which clutters their backlog and makes it harder to distinguish between committed work and exploratory planning. This reduces confidence in roadmap planning and makes it harder to have strategic conversations about trade-offs.

Allow users to create new records (initiatives, epics, features) while in scenario planning mode. These new records would be treated like any other scenario change - they would queue for review and could be confirmed (to create them for real) or discarded (to remove them entirely). This would enable true "what-if" planning: "What if we added this new strategic initiative? How would that impact our timeline and capacity?"