The previous commit captured only the .md→.mdx rename — a botched `git add`
(a stale .md pathspec aborted the whole add) dropped the actual content. This
adds it:
- casts.mjs: the assistive-editor cast definition (Tab completion → the [ERR]
validity indicator catching a misspelled table → friendly error → corrected
command). Behavior verified by a throwaway spike before scripting.
- public/casts/assistive-editor.cast (generated via `pnpm casts`)
- embed the cast under the intro on the assistive-editor page
Verified: pnpm build clean (25 pages); cast bundled, served, and referenced.
Visual playback check pending (verify via dev server/tunnel).
claude@clouddev1