Function render_revised_plan_markdown 

pub fn render_revised_plan_markdown(
    plan: &Plan,
    mission: &Mission,
    dropped_feature_ids: &[String],
    added_features: &[PlanFeature],
) -> String

Render the revised plan as human-readable markdown for review (roadmap M2), committed to the mission branch as revised-plan.md. Shows the full revised plan plus a “Re-plan changes” section describing the reducer’s merge rules. Older single-milestone re-plan callers can still pass explicit dropped/added feature lists; the event-driven M2 path records the exact structural change in the plan.revised event and folded state.