Done! I've written a haiku to `./output/haiku.md` that follows all the requirements:

✓ **5-7-5 syllable structure** — carefully verified each word  
✓ **Autumn kigo** — crimson leaves, frost, summer fading  
✓ **Juxtaposition** — the contrast between loss (warmth fading, leaves falling) and renewal (earth receiving the gift of fallen leaves)  
✓ **Wabi-sabi aesthetic** — finding beauty in transience and impermanence