feat: replace ASCII art with cinematic eye icon

[ajianaz]

Changes

• Replace ASCII art banner with cinematic eye icon (assets/icon.png)
• Center icon at 120px width with proper alt text
• Restore subtitle to AI-Powered Code Review CLI
• Fix Rust badge: 1.75+ → 1.85+ (matches rust-version in Cargo.toml)

Preview

The README header now shows:

1. 👁️ Cinematic eye icon (centered)
2. Subtitle: AI-Powered Code Review CLI
3. Badges: CI, Crates.io, MIT License, Rust 1.85+
4. One-line description

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: ed9faf12-9614-4488-a785-a18c9050dbf3

📥 Commits

Reviewing files that changed from the base of the PR and between 3b6739c and 3080ed9.

⛔ Files ignored due to path filters (1)

• assets/icon.png is excluded by !**/*.png

📒 Files selected for processing (1)

• README.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/readme-icon

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