Controlled visual source-generation trial. Do not call shell, browser, web, file-writing, delegation, or image-generation tools. Return the requested complete source directly in your final answer. Do not save files yourself. The evaluator saves your answer verbatim (stripping only a surrounding Markdown fence), supplies the stated libraries, and runs it. You may use an image-reading tool ONLY to inspect the provided reference-plan.png when present. No external assets or network. No evaluator feedback or repair round.

Return only one valid standalone SVG with width=1200 height=630 and viewBox='0 0 1200 630', no markdown. Create an original intricate paper-cut editorial illustration of a small wooden observatory in a rainy mountain forest. Exactly three visible layered mountain ridges, a curved footpath from the lower-left edge leading to the observatory door, one bicycle leaning beside the door, and a single amber-lit window as the focal point. Deep forest green, emerald, muted cream and one amber accent. Show convincing paper layer depth, coherent shadows, rain and a calm atmosphere. The bicycle must read as a bicycle at 400px wide. No letters, numbers, text, logos, people, embedded raster images, scripts, external resources or animation. Use paths, shapes, gradients, masks and filters only. Composition should be asymmetric and have generous negative space at upper-left. All objects must remain inside the viewport.