Add comprehensive GitHub Copilot instructions for AI-UltraVision SRCNN project

[Copilot]

This PR adds a comprehensive .github/copilot-instructions.md file that provides GitHub Copilot with detailed instructions for working with the AI-UltraVision SRCNN image super-resolution project.

What's Added

The instructions file includes:

• Validated Environment Setup: Step-by-step commands for installing all dependencies with measured timing expectations
• Project Structure Documentation: Complete overview of the repository layout and key files
• Working Commands: All setup and runtime commands have been tested and verified to work
• Timing Expectations: Realistic time estimates for each operation (e.g., TensorFlow installation ~40 seconds)
• Validation Scripts: Quick test commands to verify the environment is working correctly
• Known Issues & Solutions: Documentation of NumPy compatibility issues and workarounds
• Alternative Workflows: Fallback approaches when TensorFlow has compatibility issues

Key Features

Comprehensive Validation: Every command in the instructions has been tested and timed:

• System package installation: ~30 seconds
• TensorFlow/Keras installation: ~40 seconds
• Jupyter notebook startup: <1 second
• Core image processing workflow: ~1 second

Dependency Management: Addresses critical compatibility issues:

• Uses system NumPy (1.26.4) to avoid binary incompatibility
• Documents network timeout workarounds for pip installations
• Provides alternative installation paths for problematic packages

Immediate Verification: Includes ready-to-use validation commands:

python3 -c "import cv2, numpy as np, matplotlib.pyplot as plt; from skimage.metrics import structural_similarity; print('✓ All core dependencies working')"

The instructions follow the required format with imperative tone ("Run this command", "Never cancel") and include explicit "NEVER CANCEL" warnings with appropriate timeout values for long-running operations.

Fixes #4.

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• esm.ubuntu.com
  • Triggering command: /usr/lib/apt/methods/https (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

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