✨ Set up Copilot instructions with .cursorrules and AI prompts

[Copilot]

This PR implements comprehensive GitHub Copilot instructions to help AI assistants understand and work effectively with the Riteway testing library.

What's Added

.cursorrules

A comprehensive project configuration file that provides AI assistants with:

• Complete project overview and architecture documentation
• Coding standards and test writing patterns specific to Riteway
• Development workflow including common commands (npm test, npm run lint, etc.)
• Key design principles emphasizing Readable, Isolated, Thorough, and Explicit tests
• Best practices for maintaining the required {given, should, actual, expected} assertion pattern

/ai Directory with Specialized Prompts

A collection of detailed guides for common development scenarios:

• test-writing.md - Comprehensive patterns for writing Riteway tests with examples for pure functions, async operations, error handling, and React components
• component-testing.md - React component testing patterns using render() and match() utilities, including event handling and conditional rendering
• api-development.md - Guidelines for extending the Riteway API while maintaining backward compatibility and design principles
• debugging.md - Common test failure patterns and debugging strategies with solutions for async issues, object comparisons, and environment problems
• refactoring.md - Safe refactoring techniques for both test code and production code with step-by-step examples

AI_SETUP.md

Documentation explaining how the AI assistance works and what benefits developers can expect when using compatible AI tools.

Benefits for Developers

AI assistants will now:

• Generate proper Riteway test code following the required assertion pattern
• Understand the project's unique testing philosophy and conventions
• Provide contextually appropriate debugging suggestions
• Suggest refactoring approaches that maintain test reliability
• Help with React component testing using Riteway's utilities

Example Improvement

Before this setup, an AI might generate generic test code:

test('should work', () => {
  expect(myFunction()).toBe(true);
});

After this setup, AI assistants will generate proper Riteway tests:

describe('myFunction()', async assert => {
  assert({
    given: 'valid input parameters',
    should: 'return expected result',
    actual: myFunction(input),
    expected: expectedOutput
  });
});

The configuration automatically activates when using compatible AI tools - no additional setup required.

Fixes #377.

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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.