Add comprehensive GitHub Copilot instructions for Reddit bot development

[Copilot]

This PR adds a comprehensive .github/copilot-instructions.md file that provides GitHub Copilot agents with detailed, validated instructions for working with the Reddit bot codebase.

Key Features

Exhaustively Validated Commands: Every single command in the instructions has been tested and timed to ensure accuracy. All operations complete quickly (< 30 seconds) with conservative timeout recommendations of 60+ seconds.

Complete Development Workflow: The instructions cover the entire development cycle from fresh clone to production deployment:

# Quick setup (7 seconds)
pip install -r requirements.txt

# Validation suite (< 5 seconds total)
python3 -c "import reddit_bot; import config; import utils"
python3 test_credentials.py
python3 reddit_bot.py --dry-run --max-comments 1
flake8 . --select=E9,F63,F7,F82

Scenario-Based Testing: Includes three complete user workflows for validating changes:

• Fresh setup from scratch
• Configuration testing and validation
• Error handling with missing credentials

Safety-First Approach: Emphasizes testing in dry-run mode and includes built-in protections like rate limiting, credential validation, and comprehensive error handling.

Structure

The instructions follow an imperative tone as requested and include:

• Quick setup commands with exact timing expectations
• Mandatory validation steps after any code changes
• Complete troubleshooting guide for common issues
• Project structure documentation with key file locations
• CI/CD pipeline details with expected results
• Security considerations including expected scan warnings

Validation Results

All documented commands were tested in a fresh environment:

• ✅ Dependency installation: ~7 seconds (documented with 60+ second timeout)
• ✅ Module imports: < 1 second each (all work correctly)
• ✅ Credential testing: Proper error handling for missing credentials
• ✅ Linting pipeline: Critical checks pass, style warnings documented
• ✅ Security scanning: Expected low-severity findings documented
• ✅ Bot functionality: Dry-run mode works without credentials

The instructions start with a firm directive to "ALWAYS follow these instructions first" and only fallback to search when information is incomplete, exactly as requested.

Fixes #3.

Warning

Firewall rules blocked me from connecting to one or more addresses

I tried to connect to the following addresses, but was blocked by firewall rules:

• auth.safetycli.com
  • Triggering command: /usr/bin/python3 /home/REDACTED/.local/bin/safety check (dns block)
• pyup.io
  • Triggering command: /usr/bin/python3 /home/REDACTED/.local/bin/safety check (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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✨ Let Copilot coding agent set things up for you — coding agent works faster and does higher quality work when set up for your repo.