lacma-2026: move video assets to CDN + prep for full boot→shutdown sequence

Video was being served from lith (system/public/lacma-2026/) which
bloats git and doesn't use the AC asset CDN pattern. Move to
system/public/assets/lacma-2026/ (gitignored, synced via
npm run assets:sync:up) and point the <video> tag at
https://assets.aesthetic.computer/lacma-2026/ac-native-demo.{mp4,webm}.

Assets now live on Digital Ocean Spaces:
https://assets.aesthetic.computer/lacma-2026/ac-native-demo.mp4
https://assets.aesthetic.computer/lacma-2026/ac-native-demo.webm
https://assets.aesthetic.computer/lacma-2026/ac-native-demo-poster.jpg

Fix a conceptual error in the caption: the "bye @jeffrey ♡" was HTML
text, but it should be a shutdown animation baked into the video —
the ac-native C runtime already renders the "hi @jeffrey" boot
animation; a matching "bye @jeffrey" shutdown animation needs to be
written in the same style, and then captured into the next demo.

Updated caption now lists the full target sequence chain
(boot → prompt → notepat → waltz → back → shutdown) rather than
the truncated stop-at-fade we actually have, and replaces the HTML
"bye" with "captured live · no editing tricks" as a quieter tag.

Updated § Application at a Glance Video row to note the current
23-second loop vs the next planned capture with shutdown animation.

Deletes the duplicate binaries from system/public/lacma-2026/.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>