Write first Litmus blogpost: What If You Could Test Drive a Terminal Theme? (litmus-f6mk)

First promotional blogpost for Litmus. Publish on personal blog + Reddit (r/commandline, r/unixporn, r/rust). Goal: drive traffic to litmus.edger.dev. Tone: casual dev storytelling + visual showcase. ~550 words, 5 sections with screenshots. Approved structure: 1) Frustration hook + hero screenshot, 2) Core value prop + comparison screenshot, 3) Real output differentiator + fixture screenshots, 4) Accessibility twist + CVD screenshot, 5) CTA.

Summary of Changes

Drafted the full blogpost at ~/blog/content/posts/what-if-you-could-test-drive-a-terminal-theme.md with 6 screenshots placed at ~/blog/static/images/litmus-*.png. ~500 words, 5 sections following the approved outline.