Add comprehensive Copilot instructions for efficient agent development

[Copilot]

This PR adds a comprehensive .github/copilot-instructions.md file to help coding agents work more efficiently with this repository by providing essential information upfront, reducing exploration time and preventing build failures.

What was added

The instructions document provides:

• Repository overview: Clear description of the browser-based LLM chat application, its serverless architecture, and local IndexedDB storage
• Complete build guide: All necessary commands with verified timings and expected outputs
• Project architecture: Detailed breakdown of the React + TypeScript + Vite stack with key file locations
• Known issues documentation: Current linting errors, test failures, and build warnings with explanations

Key benefits for agents

1. Prevents common mistakes: Documents that linting issues are non-blocking and that pnpm (not npm) must be used
2. Sets proper expectations: Explains that tests currently fail due to RouterProvider/IndexedDB mocking issues
3. Reduces exploration time: Provides comprehensive file structure and component organization details
4. Improves success rate: Documents the exact command sequence and timing expectations for builds

Example of critical information included

The instructions clearly state upfront that:

• Build warnings about large chunks (>500KB) are expected due to syntax highlighting dependencies
• Current linting errors in UI components are known issues that don't block builds
• The application is entirely client-side with no server setup required
• All data is stored locally in IndexedDB using Dexie

This documentation will significantly reduce the likelihood of agent PRs being rejected due to misunderstanding the project structure, build process, or attempting to "fix" known non-blocking issues.

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Project	Deployment	Preview	Comments	Updated (UTC)
browser-chat-llm	Ready	Preview	Comment	Sep 22, 2025 10:08am