Add hanzo-logo.svg (mono black) and hanzo-logo.png from the logo repo.
npm package READMEs use the PNG via GitHub raw URL so the correct mark
renders on npmjs.com instead of the old every-logo.png.
Remove the every-logo.png image reference from all three READMEs
(main, dev-cli, codex-cli/.pack) and use a text heading instead.
The old logo was still showing "EVERY CODE" on the npm page.