Add comprehensive GitHub Copilot instructions for kkuko-utils development workflow

[Copilot]

Created a comprehensive .github/copilot-instructions.md file that provides GitHub Copilot coding agents with detailed, validated instructions for working effectively in the kkuko-utils codebase.

What's Included

Environment Setup & Dependencies

• Node.js v20+ and npm 10+ requirements (validated with v20.19.4/10.8.2)
• Complete dependency installation process with network connectivity workarounds
• Environment variable configuration for Supabase integration

Development Workflow

• Testing: 85 tests pass consistently in ~21 seconds with full coverage reporting
• Linting: ESLint validation passes with zero warnings/errors in ~3 seconds
• Development server: Next.js with Turbopack starts in ~2 seconds on localhost:3000
• Build process: Documented network restrictions and Google Fonts dependency issues

Network Connectivity Solutions

• xlsx dependency: Workaround for cdn.sheetjs.com blocking (use npm version ^0.18.5)
• Google Fonts: Build process fails in network-restricted environments (~15 seconds)
• Environment variables: Minimal Supabase configuration for local development

Validation & Testing Procedures

• Manual testing scenarios for word extraction tools, Korean/English mission features
• Key user workflows: manager tools, file merging, word combination utilities
• Specific timeout values with "NEVER CANCEL" warnings for long-running operations

Repository Structure & Key Features

• Manager tools (/app/manager-tool/) for word extraction and processing
• Comprehensive test coverage (/__tests__/manager-tool/extract/)
• API routes, Supabase integration, and TypeScript configuration details

Validation Process

Every command and instruction was thoroughly tested:

• ✅ All 85 tests pass consistently
• ✅ ESLint runs without errors
• ✅ Development server starts and serves pages correctly
• ✅ Key application features verified through manual testing
• ✅ Network issues documented with exact error messages and workarounds
• ✅ Timing measurements provided with appropriate timeout recommendations

The instructions follow the imperative tone requirement and provide exhaustive validation steps that enable coding agents to work effectively without trial-and-error.

Fixes #92.

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:

• cdn.sheetjs.com
  • Triggering command: npm ci (dns block)
  • Triggering command: npm install (dns block)
• fonts.googleapis.com
  • Triggering command: /usr/local/bin/node /home/REDACTED/work/kkuko-utils/kkuko-utils/node_modules/next/dist/compiled/jest-worker/processChild.js (dns block)
  • Triggering command: next-server (v15.5.0) (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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💡 You can make Copilot smarter by setting up custom instructions, customizing its development environment and configuring Model Context Protocol (MCP) servers. Learn more Copilot coding agent tips in the docs.

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Project	Deployment	Preview	Comments	Updated (UTC)
kkuko-utils	Ready	Preview	Comment	Aug 23, 2025 0:46am