# artoo-kit 0.8.1
Long-form article layout, evidence regions, and the provenance panel.
The built-in site library: an Artoo-owned, self-contained foundation for public
artifacts. Vendored into an artifact at `site/lib/artoo-kit/` with a pinned
hash — changing the kit here does not rewrite already-vendored bytes; `artoo
lib update artoo-kit` is the explicit upgrade boundary.
Files (all under `assets/`, all vendored):
| file | role |
|------|------|
| `tokens.css` | design tokens: color, type roles, spacing, the chart palette |
| `base.css` | resets and page defaults |
| `article.css` | long-form article grid (prose + margin gutter) |
| `components.css` | nav, cards, callouts, badges, stats, colophon, provenance |
| `kit.js` | theme toggle, mobile nav, legacy mermaid.js boot |
| `provenance.js` | provenance panel hydration + in-prose claim anchors |
| `favicon.svg` | default site icon (link it to silence the `/favicon.ico` 404) |
## Favicon
Every page should carry a favicon; without one the browser requests
`/favicon.ico` and logs a 404 on every load. Reference the vendored icon in
``:
```html
```
## Provenance panel
The panel renders an artifact's lineage — sources with grades and
independence, claims with status and verification-method badges, counts, and
an optional notebook vintage — from `site/data/provenance.json`. `artoo build`
and `artoo provenance` write it from provider-neutral `artoo-evidence/1` or
adapt an attached Flip notebook's `flip-render/1` projection.
It is **progressive**: with no projection present the panel hides itself and
the page reads exactly as authored. To add it to a hand-authored page:
```html
```
`data/provenance.js` sets `window.__ARTOO_PROVENANCE__` so the panel hydrates
from a `file://` URL with no server (a bare `fetch()` of a sibling JSON is
blocked under `file://`; a `