Mobile Release Scheduler: Resource-Constrained Critical Path (2D)

This 2D companion to the 3D Mobile Release Scheduler runs the exact same 13-task release DAG and resource-constrained project scheduling (RCPSP) list-scheduler — backend APIs, iOS and Android builds, offline sync, QA and store submission all competing for a limited Backend/iOS/Android/QA team — but renders the result as a pannable, zoomable Gantt timeline instead of a 3D bar chart. Drag the team-capacity sliders and watch the schedule re-solve live, revealing the point past which extra headcount stops shortening the release and the plan is purely waiting on its critical path. This version also corrects a bug in the 3D sim's "critical path" readout (see "How it works" below): it now reports the true unconstrained project floor instead of a single sink task's own duration.