[WIP] ✨ Set up Copilot instructions

[Copilot]

✅ Complete Copilot Instructions Generated

Successfully created comprehensive .github/copilot-instructions.md with exhaustive development guidance for StreamVault.

Completed Validation

• Analyze repository structure and dependencies
• Test Node.js and pnpm version requirements
• Measure dependency installation timing (39 seconds)
• Identify and document all TypeScript errors (343 total)
• Test development server startup and behavior
• Validate unit test execution (14 failed, 7 passed suites)
• Document build system limitations and failures
• Test all validation commands for accuracy

Instructions Cover

• Environment setup with exact Node.js 22+ and pnpm 10.15.0+ requirements
• Installation process with verified timings and warnings
• Working operations (dev server, type checking, linting, unit tests)
• Non-working operations with clear explanations (builds, E2E tests, Firebase)
• Manual validation scenarios with exact commands and expected outputs
• Timeout specifications with "NEVER CANCEL" warnings
• Repository structure and key files documentation
• Known issues with detailed technical explanations
• Troubleshooting guidance for common problems

Key Features

• Imperative tone throughout ("Run this command", "Do not do this")
• Exhaustive validation - every command tested and timed
• Exact specifications - 343 TypeScript errors, 39-second installs, etc.
• Critical warnings about broken functionality
• Baseline metrics for regression detection
• Complete technical context for the codebase state

The instructions provide a comprehensive guide for GitHub Copilot to work effectively in this partially-broken codebase while being transparent about limitations.

Fixes #38.

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[github-actions]

🤖 AI-Assisted Code Review

🔒 Security Analysis (via CodeQL):

✅ CodeQL scan complete. View security alerts for this PR

🎯 Code Quality Analysis (via ESLint & TypeScript):

✅ No critical ESLint errors found.
⚠️ TypeScript errors detected. Please run pnpm type-check locally to see details.

🎬 StreamVault Specific Reminders:

• Authentication: Have you tested all user roles (viewer, streamer, admin)?
• Payments: If you touched Stripe code, did you test the webhook signature?
• Storage: Are new GCS interactions covered by security rules and signed URLs?