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+# GitHub Copilot Instructions for LODA Language Website
+
+## Project Overview
+
+This is the source code for the LODA Language website (https://loda-lang.org), built with Jekyll static site generator. LODA is an assembly language, computational model, and tool for mining integer sequences.
+
+## Technology Stack
+
+- **Static Site Generator**: Jekyll (GitHub Pages compatible, version ~219)
+- **Web Editor**: Interactive LODA program editor using:
+  - CodeMirror for code editing
+  - LODA-RUST WASM for program execution
+  - Chart.js for visualization
+  - Web Workers for async execution
+- **Styling**: Jekyll Minima theme with custom CSS
+- **Languages**: Markdown, HTML, JavaScript, YAML, Ruby (for Jekyll)
+
+## Repository Structure
+
+- `/` - Jekyll site root with Markdown pages
+- `/_config.yml` - Jekyll configuration
+- `/_edit/` - Interactive LODA program editor (HTML, JS, WebAssembly)
+- `/_includes/` - Jekyll include templates
+- `/_data/` - Jekyll data files
+- `/css/`, `/js/`, `/images/` - Static assets
+- `/spec.markdown` - LODA language specification
+- `/contributing.md` - Contribution guidelines
+- `/mcp.md` - LODA Model Context Protocol (MCP) server documentation
+
+## Key Project Concepts
+
+### LODA Language
+- Assembly-like programming language for integer sequences
+- Designed for efficient execution, optimization, and synthesis
+- Used for mining integer sequences (OEIS)
+- Operations include arithmetic, combinatorics, number theory, bitwise, and control flow
+
+### Program Mining
+- Community-driven effort to discover integer sequence programs
+- Uses BOINC distributed computing and local miners
+- Programs stored in separate [loda-programs](https://github.com/loda-lang/loda-programs) repository
+
+### MCP Integration
+- LODA has a Model Context Protocol (MCP) server
+- Enables AI agents to access LODA API at `https://api.loda-lang.org/v2/mcp/`
+- Can be integrated with VS Code and GitHub Copilot
+
+## Development Guidelines
+
+### Jekyll Site Development
+- Pages use front matter with layout, title, and permalink
+- Build site with: `bundle exec jekyll serve`
+- Site content is in Markdown files with `.md` or `.markdown` extensions
+- Custom collections defined in `_config.yml` (e.g., `_edit` directory)
+
+### Interactive Editor
+- Located in `/_edit/` directory
+- Uses CodeMirror with custom LODA mode
+- Web Worker pattern for async program execution
+- WASM integration for running LODA programs in browser
+- Do not modify CodeMirror library files (they are vendored)
+
+### Code Style
+- Markdown: Follow existing formatting in documentation
+- JavaScript: Use clear variable names, ES6+ features where appropriate
+- HTML: Semantic markup, accessible elements
+- Keep LODA code examples simple and well-commented
+
+### Documentation
+- LODA specification is the authoritative reference in `/spec.markdown`
+- Examples should be clear and demonstrate one concept at a time
+- Include both code and expected output where relevant
+- Use OEIS sequence IDs (e.g., A000045 for Fibonacci) when applicable
+
+## Common Tasks
+
+### Adding New Pages
+1. Create `.md` or `.markdown` file in root
+2. Add front matter with layout, title, permalink
+3. Write content in Markdown
+4. Jekyll will automatically build and include in navigation
+
+### Updating LODA Specification
+- Edit `/spec.markdown`
+- Follow existing structure with anchors for linking
+- Include operation examples with assembly code blocks
+- Use proper mathematical notation and terminology
+
+### Modifying Interactive Editor
+- Main logic in `/_edit/index.js` (PageController class)
+- Worker logic in `/_edit/worker.js`
+- LODA mode definition in `/_edit/web/codemirror_mode_loda.js`
+- Test changes locally before committing
+
+## Testing and Building
+
+### Local Development
+```bash
+# Install dependencies
+bundle install
+
+# Serve site locally
+bundle exec jekyll serve
+
+# Site will be available at http://localhost:4000
+```
+
+### File Exclusions
+- Jekyll excludes: `_site/`, `.sass-cache/`, `.jekyll-cache/`, `.jekyll-metadata/`
+- Version control ignores: `.DS_Store`, `vendor/`, `openapi.v2.yaml`
+
+## Contributing
+
+- Follow guidelines in `/contributing.md`
+- Report bugs/features in appropriate loda-lang GitHub repository
+- Join discussion on Discord or via email
+- Submit pull requests with clear descriptions
+- Maintain compatibility with GitHub Pages
+
+## Important Notes
+
+- This is a static Jekyll site - no server-side processing
+- The `_edit` directory is treated as a special collection (no Jekyll processing)
+- CodeMirror and other vendored libraries should not be modified
+- LODA execution happens client-side via WebAssembly
+- MCP server runs separately at api.loda-lang.org
+
+## Resources
+
+- [LODA GitHub Organization](https://github.com/loda-lang)
+- [LODA Programs Repository](https://github.com/loda-lang/loda-programs)
+- [LODA API](https://api.loda-lang.org/v2/)
+- [LODA MCP Server](https://api.loda-lang.org/v2/mcp/)
+- [Community Discord](https://loda-lang.org/discord)
+- [Mining Dashboard](https://dashboard.loda-lang.org/grafana/)
+- [BOINC Project](https://boinc.loda-lang.org/loda/)