Linear Roadmap Sync

Sync a Project Roadmap & Timeline xlsx into Linear by creating project milestones for each major component/pipeline and issues for each deliverable underneath them. Use whenever the user wants to push a roadmap into Linear, populate Linear from a tracker, or set up a Linear project from a roadmap doc — phrased like 'put this roadmap into Linear', 'create Linear issues from the tracker', 'sync this xlsx to Linear'. Trigger when the user provides or references a Project Roadmap xlsx and asks for it to be reflected in Linear. Maps roadmap statuses (Completed/In-Process/Testing/Cancelled) to Linear workflow states, skips milestones and issues whose names already exist in the …