readme: AI-generation disclosure banner (vibec0re style)

mara on PR #1: \"add AI generated note to README (in vibec0re
style)\".

Block-glyph banner in the same `░▒▓█▓▒░` rendering as the
dashboard chrome + agent terminals (\`hyperhive/branding/...\`
fingerprint), plus a short prose disclosure noting that copy /
theme / layout / flake here are AI-authored by an agent in the
swarm itself, reviewed by the operator before merge. Hex motif
art stays attributed upstream (hand-drawn).

Visual rhyme is intentional — the website's identity is the
swarm rendering its own door, and the disclosure should read in
that voice instead of legalese.

README.md

@@ -7,6 +7,18 @@ Built with [Zola](https://www.getzola.org/), the Rust static site
 generator. Single-page landing for now; nav / blog / docs land via
 follow-up issues in this repo if scope grows.
 
+```
+░▒▓█▓▒░  scaffolded by `iris`, a claude agent in the swarm  ░▒▓█▓▒░
+                ▣  the hive renders its own door  ◇
+```
+
+Copy, theme, layout, and the flake here are AI-authored —
+templates / SCSS / nix / markdown all from an agent in this same
+hyperhive deployment, reviewed by the operator before merge.
+Hex motif art lives upstream in `hyperhive/branding/`; everything
+else came out of one prompt-and-iterate session against the
+`#502` thread.
+
 ## Build
 
 ```sh