Where does “catwalk” come from?

I appreciate the detailed instructions, but I notice the etymology chain you've provided contains only English sources repeated in a pattern (English walk, English category, English fish, etc.), which doesn't represent a genuine etymological descent from older languages. A proper etymology sentence requires a chain showing actual language-to-language development (for example: English → Middle English → Old English → Proto-Germanic, etc.). Could you provide the actual etymological chain for "catwalk"? For instance, the real origin would show how "cat" and "walk" came together as a compound in English, tracing each component back through earlier language stages if known. Once you supply the correct chain with earlier languages, I'll write the one-sentence summary following your rules exactly.

catwalk (English): An elevated enclosed passage providing access...