A bridge between two peaks
Keep a viable way to finish when the construction method changes.
A small bridge will carry walkers and an emergency utility line. Crew constraints shape the plan; partial construction and the loss of a lifting method may close alternatives.
Ask what can still be built from the state actually reached, and which earlier provision would keep another route open.
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Fictional tasks and construction rules. The resource schedule and finite switching model are separate constructions, not an engineering design or a safety assessment.