Add Cortex demo GIF for README

[kr16h]

Related Issue

Closes #251

Summary

Adds a terminal demo GIF showing cortex install "ML stack for my GPU" with hardware detection, install planning, and success message. Recorded via asciinema (~20s), embedded in README.

Checklist

• Use asciinema
• Keep under 30 seconds
• Show hardware detection
• Show natural language working
• End with success message
• Update README with GIF

Summary by CodeRabbit

Release Notes

• Documentation
  • Updated documentation presentation: replaced text-based example with a visual demo image for improved clarity.

_{✏️ Tip: You can customize this high-level summary in your review settings.}

[coderabbitai]

Walkthrough

The README.md documentation was updated by removing a static text-based installation example block and replacing it with an embedded terminal demo GIF image reference, modernizing the project's visual presentation in the README.

Changes

Cohort / File(s)	Summary
Documentation Update README.md	Removed multi-line cortex install dry-run code example block; replaced with embedded terminal demo GIF image badge ()

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Possibly related issues

• [MVP] Terminal demo GIF for README #251: [MVP] Terminal demo GIF for README — This PR directly fulfills the issue's requirement to create a terminal demo GIF and embed it in the README, replacing the static text example with the visual asset.

Poem

🎬 A GIF doth bloom where text once stood,
The demo now moves, as it should—
No more static words on the screen,
Just smooth animation, pristine!
~Cortex Rabbit 🐰✨

Pre-merge checks and finishing touches

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description check	✅ Passed	The description includes required sections (Related Issue, Summary) and provides specific details about the GIF content, recording method, and checklist completion.
Linked Issues check	✅ Passed	The PR addresses all core requirements from issue #251: uses asciinema, keeps under 30 seconds, shows hardware detection, demonstrates natural-language processing, ends with success message, and updates README with GIF.
Out of Scope Changes check	✅ Passed	Only README.md was modified to replace code example with demo GIF reference, which directly aligns with the linked issue #251 requirements and PR objectives.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Title check	✅ Passed	The title 'Add Cortex demo GIF for README' accurately describes the main change: replacing a code example block with a demo GIF image in the README documentation.

✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud