Three compositing bugs in a row — turned out per-channel feathering was running on single-instrument composites where it makes no sense, the memory budget for NIRCAM was miscalculated, and the multi-instrument feather needed a union mask instead of per-channel intersections.
The MIRI boundary kept leaking visual artifacts through the blend — fixed the transition math (smoothstep + CIELAB lerp + sRGB gamma on the mask) and then chased a related OOM that only showed up at multi-instrument resolution.
The big multi-instrument compositing push. Started with per-channel feathering that couldn't fix the MIRI color palette shift, evolved to instrument-level blending, then realized signal fading destroys detail and invented color-contribution feathering — lerping between palette interpretations instead of fading signals.
Ten PRs. The headline features: coverage-aware pixel blending eliminates the hard edges where different instruments overlap, edge feathering smooths the FOV boundaries, and wallpaper-ready export adds rotation and resolution presets. Also shipped curated NASA-style recipes for famous targets, and rebuilt the Result step layout.
Seven PRs shipped — most of them fixing things that were silently wrong. Auto-crop removes the black borders that made every composite look like a padded square. Recipes now filter out non-science observations. And the composite pipeline finally routes through the authenticated API client like everything else should have from the start.