✨ Enhance Copilot instructions with comprehensive guidance

[Copilot]

Overview

This PR enhances the .github/copilot-instructions.md file to provide comprehensive guidance for GitHub Copilot when working with the B1MG Variant Voting repository, following best practices documented at https://gh.io/copilot-coding-agent-tips.

Changes Made

Fixed Issues

• Syntax Error: Fixed missing closing backtick on the covr::package_coverage() command (line 15)

Enhancements

The Copilot instructions file has been significantly expanded from 15 lines to 78 lines with the following new sections:

1. Project Overview - Brief description of the voting system as an R package containing a Shiny application

2. Project Structure - Detailed documentation of:

   • R package source code organization (/R/)
   • Module files (mod_*.R) and their purposes
   • Bundled resources (/inst/shiny-app/)
   • Test structure (/tests/testthat/)
   • External environment (app_env/)

3. Enhanced Coding Conventions - Added specific examples:

   • UI function naming: <module>UI (e.g., votingUI)
   • Server function naming: <module>Server (e.g., votingServer)
   • Module file naming with examples
   • Documentation requirements (roxygen2)

4. Enhanced Testing - Added information about:

   • Helper file conventions (helper-*.R)
   • Module testing with testServer

5. Build and Development - Complete command reference:

   • Building: make build or R CMD build .
   • Installing: make install
   • Running: make run or R -e "ShinyImgVoteR::run_app()"
   • Checking: make check
   • Documentation generation

6. Configuration - Documented:

   • Config file location
   • Environment variables (IMGVOTER_BASE_DIR, IMGVOTER_CONFIG_FILE_PATH, IMGVOTER_IMAGES_DIR)

7. Key Workflows - Quick reference for:

   • Development workflow: make dev
   • CI/CD simulation: make ci
   • Application startup sequence

8. Database - Information about:

   • SQLite database usage
   • Database utilities location
   • Schema overview

9. Important Notes - Architecture decisions:

   • R package design rationale
   • External data organization
   • Resource referencing with get_app_dir()

Benefits

This enhancement will help GitHub Copilot:

• Better understand the project structure and architecture
• Generate code that follows project conventions
• Suggest appropriate commands for common tasks
• Maintain consistency with existing patterns

The instructions maintain consistency with the existing AGENTS.md file while providing more detailed, actionable guidance specifically for Copilot.

Closes #<issue_number>

Original prompt

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This section details on the original issue you should resolve

<issue_title>✨ Set up Copilot instructions</issue_title>
<issue_description>Configure instructions for this repository as documented in Best practices for Copilot coding agent in your repository.

</issue_description>

Comments on the Issue (you are @copilot in this section)

Fixes #43

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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.