[readme] add demo GIF

[NiveditJain]

Summary

• Adds failproofai-hq.gif as a hero demo image just below the tagline in README.md
• Adds ### Docs entry under ## Unreleased in CHANGELOG.md
• Gitignores WSL *:Zone.Identifier artifacts

Test plan

• Verify GitHub renders the GIF inline on the README (file is ~19 MB — at the upper end of GitHub's inline-render comfort zone; if rendering fails we'll compress or move to LFS / asset host)
• CI green

🤖 Generated with Claude Code

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: ebc26f6b-3549-4bfe-a52a-8835950da481

📥 Commits

Reviewing files that changed from the base of the PR and between 7d40631 and 3a42be9.

⛔ Files ignored due to path filters (1)

• failproofai-hq.gif is excluded by !**/*.gif

📒 Files selected for processing (3)

• .gitignore
• CHANGELOG.md
• README.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch add-readme-demo-gif

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