Whole-path audio export: render the ENTIRE loop, not just the current song

Paul: 'export the entire path, not just the current song. The whole mix.' journey.js buildLoopPlan groups the offline loop-walk into topology-stable RUNS (a new run = a reverb/master/unit-topology change = a crossfade seam) and enumerates every found/sampler/vocoder source the loop touches (decode…

• export.js exportLoopAudio decodes the sources, drives the worker, and assembles a WAV Blob-of-parts (int16 bodies, no giant contiguous copy) or feeds the mp3 worker block-by-block

▶ Play it: Rail Replacement Rapture — a bed-heavy genre where the found-sound layer carries the room https://stellate.app/?genre=transitwave&seed=7739&path=749.12536,768.12569,730.12569&xdur=13.122

1f12c0f https://github.com/aboard-io/stellate/commit/1f12c0f3dfb085fea4995da1cead32e8b638d3ca