Add semantic segmentation examples banner

[Bovey0809]

Summary

• Add docs/semantic-segmentation-examples.avif banner image for the semantic segmentation docs page
• 1920x1211 AVIF image showing original images, colored semantic masks, and overlay visualizations
• Uses Cityscapes color palette with bus.jpg and zidane.jpg examples

Context

Referenced by docs/en/tasks/semantic.md in the main ultralytics repo (feat/semantic-segmentation branch).

🛠️ PR Summary

_{Made with ❤️ by Ultralytics Actions}

🌟 Summary

Updates the ultralytics/assets repository with changes related to semantic segmentation example assets, likely refreshing documentation visuals and supporting files 🖼️✨

📊 Key Changes

• Updated asset files in the repository, including the auto-generated file docs/semantic-segmentation-examples.avif.
• The changed file appears to be documentation/media-related rather than core code or model logic.
• No source-code diff was provided in the PR details shared here, so the visible update is limited to repository assets/docs content 📁

🎯 Purpose & Impact

• Improves or refreshes documentation visuals for semantic segmentation examples, making examples clearer and more polished for users 📚
• Helps keep repository assets aligned with the latest docs or model outputs.
• Likely has little to no impact on APIs, training workflows, or inference behavior since the visible change is asset-focused ✅
• For most users, this should be a low-risk update that mainly enhances presentation and documentation quality 🎨

📋 Skipped 1 file (lock files, generated, images, etc.)

• docs/semantic-segmentation-examples.avif

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[UltralyticsAssistant]

👋 Hello @Bovey0809, thank you for submitting a ultralytics/assets 🚀 PR! This is an automated message to help with review, and an engineer will assist you soon. Please review the checklist below to help ensure a smooth integration of your update 🛠️

• ✅ Define a Purpose: Clearly explain the purpose of your fix or feature in your PR description, and link to any relevant issues. Ensure your commit messages are clear, concise, and adhere to the project's conventions.
• ✅ Synchronize with Source: Confirm your PR is synchronized with the ultralytics/assets main branch. If it's behind, update it by clicking the 'Update branch' button or by running git pull and git merge main locally.
• ✅ Ensure CI Checks Pass: Verify all Ultralytics Continuous Integration (CI) checks are passing. If any checks fail, please address the issues.
• ✅ Update Documentation: Update the relevant documentation for any new or modified features.
• ✅ Add Tests: If applicable, include or update tests to cover your changes, and confirm that all tests are passing.
• ✅ Sign the CLA: Please ensure you have signed our Contributor License Agreement if this is your first Ultralytics PR by writing "I have read the CLA Document and I sign the CLA" in a new message.
• ✅ Minimize Changes: Limit your changes to the minimum necessary for your bug fix or feature addition. "It is not daily increase but daily decrease, hack away the unessential. The closer to the source, the less wastage there is." — Bruce Lee

For more guidance, please refer to our Contributing Guide. Don't hesitate to leave a comment if you have any questions. Thank you for contributing to Ultralytics! 🚀

[UltralyticsAssistant]

🔍 PR Review

_{Made with ❤️ by Ultralytics Actions}

All 1 changed files are generated/vendored (skipped review)

📋 Skipped 1 file (lock files, generated, images, etc.)

• docs/semantic-segmentation-examples.avif

[UltralyticsAssistant]

🎉 Thanks for the great contribution, @Bovey0809 — and shoutout to @glenn-jocher for helping bring this over the finish line!

As Florence Nightingale said, “I attribute my success to this: I never gave or took any excuse.” This PR reflects that same spirit: thoughtful updates to the semantic segmentation example assets that help keep the docs polished, current, and more helpful for everyone using Ultralytics. Even small visual improvements can make a big difference in how clearly users understand and trust the workflow.

Really appreciate the care behind this update — every refinement like this strengthens the experience for the whole community 🚀