Two updates that move the NLE from "editor scaffold" to "editor that ships a file." Opening the NLE now spawns the standard track layout, one video track (V1) and three audio tracks (A1, A2, A3), matching what every professional editor starts with. And the assemble endpoint that was a stub earlier today is now the real implementation. Press assemble and Voysey compiles the current cut through Necto into an actual rendered video. The full round trip from production, into the NLE, out as a rendered file works end to end.