Add comprehensive GitHub Copilot instructions for clarifai-python SDK

[Copilot]

Created a comprehensive .github/copilot-instructions.md file that provides detailed guidance for GitHub Copilot coding agents working with the Clarifai Python SDK. The instructions follow an imperative tone and prioritize validated, working commands with explicit timing and timeout recommendations.

Key Features

Development Setup Instructions:

• Bootstrap commands with measured timing (virtual environment: 3s, pip install: 30s)
• Both pip and uv-based workflows (CI-preferred approach)
• Network limitation documentation and practical workarounds
• "NEVER CANCEL" warnings with specific timeout values for long-running operations

Core Development Workflow:

• Linting with ruff check . --fix (~0.04s)
• Code formatting with ruff format . (~0.04s)
• Testing scenarios and validation commands
• Pre-commit hook setup and usage

Critical Environment Limitations:

• Documents network connectivity issues that cause PyPI timeouts in many environments
• Provides alternative development approaches when package installation fails
• Includes specific error messages and troubleshooting steps

Repository Navigation Guide:

• Key directories: clarifai/ (source), tests/ (test suite), .github/workflows/ (CI)
• Important configuration files: .ruff.toml, pyproject.toml, requirements*.txt
• CLI command structure and available operations

Validation Scenarios:

• Import testing: python -c "import clarifai; print(f'Version: {clarifai.__version__}')"
• CLI functionality verification: clarifai --help
• Model and pipeline development workflows
• Authentication setup with CLARIFAI_PAT environment variable

Practical Examples:

• Complete CLI command reference with help output samples
• Common error messages and their solutions
• File structure listings and package information
• Development task workflows for code changes

The instructions were validated through extensive testing of the development workflow, measuring actual command execution times, and documenting real network connectivity limitations encountered during validation.

Fixes #747.

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✨ Let Copilot coding agent set things up for you — coding agent works faster and does higher quality work when set up for your repo.

[github-actions]

Package	Line Rate	Health
clarifai	43%	❌
clarifai.cli	43%	❌
clarifai.cli.templates	28%	❌
clarifai.client	67%	➖
clarifai.client.auth	67%	➖
clarifai.constants	100%	✔
clarifai.datasets	100%	✔
clarifai.datasets.export	80%	✔
clarifai.datasets.upload	75%	➖
clarifai.datasets.upload.loaders	37%	❌
clarifai.models	100%	✔
clarifai.modules	0%	❌
clarifai.rag	72%	➖
clarifai.runners	52%	➖
clarifai.runners.models	59%	➖
clarifai.runners.pipeline_steps	45%	❌
clarifai.runners.pipelines	80%	✔
clarifai.runners.utils	62%	➖
clarifai.runners.utils.data_types	72%	➖
clarifai.schema	100%	✔
clarifai.urls	60%	➖
clarifai.utils	56%	➖
clarifai.utils.evaluation	67%	➖
clarifai.workflows	95%	✔
Summary	62% (7733 / 12515)	➖

Minimum allowed line rate is 50%