[cwage]

Add the recent quietlife.net Asterism post to the "What I'm Up To" carousel.

Changes

• New entry in _data/now.yml for Asterism (2026-08-16), using the wide winter view image (Pleiades and Andromeda) from the post's second real-world example.
• Appended last in the file so it renders as the first slide (the carousel iterates the list reversed).

Test Plan

• Built the site in docker and verified the rendered index.html shows four slides with Asterism as the active one.
• Previewed locally via docker compose and confirmed the carousel renders all four entries.

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