giles 8aedbc9e62 Add version logging, Markdown card menu item, and oembed card types ...

- sx-editor prints version on init: [sx-editor] v2026-03-02b-exorcism
- Add Markdown to card insert menu with /markdown and /md slash commands
- Add YouTube, X/Twitter, Vimeo, Spotify, CodePen as dedicated embed
  menu items with brand icons (all create ~kg-embed cards)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

2026-03-02 20:18:41 +00:00

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