机械面板拆卸

Mechanical sci-fi disassembly sound, 220 ms. Metal panels unclamping: a short 90 Hz sub-thump, a dry 1.5 kHz ratchet scrape that lasts 80 ms, then a soft 400 Hz metallic settle. Sounds like a machine being taken apart cleanly and deliberately, not destroyed. Dry, industrial, no reverb, no explosion, no debris, no musical tone.