init geek calc

QWEN.md

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+# Qwen Code Instructions: Geek Calculator
+
+## Project Overview
+Calculator application with standard and RPN modes, keyboard-first operation, and terminal-like UI aesthetic. Built with vanilla HTML/CSS/JS with zero dependencies and <50KB total payload.
+
+## Key Technologies
+- HTML5, CSS3, JavaScript ES6+
+- Service Workers for offline capability
+- LocalStorage for history persistence
+- ES6 Modules for code organization
+- Custom test harness (no dependencies)
+
+## File Structure
+```
+index.html          # Main application file
+styles.css          # Dark terminal theme, responsive layout
+app.js              # Main application logic with modules:
+  ├── calculator.js    # Core calculation logic
+  ├── rpn-calculator.js # RPN calculator implementation
+  ├── ui.js           # User interface interactions
+  ├── state.js        # Application state management
+  └── utils.js        # Utility functions
+service-worker.js   # Offline functionality
+manifest.webmanifest # PWA capabilities
+tests/              # Test directory
+```
+
+## Implementation Notes
+- Keep bundle size under 50KB
+- Full keyboard navigation required
+- ARIA roles and accessibility features
+- ASCII banner in <pre> tag
+- Blinking cursor effect
+- Easter eggs for fun
+- RPN stack data structure
+- Calculation history with re-run capability
+- Command palette accessible with "@"
+
+## Testing
+- Unit tests for core arithmetic operations
+- Unit tests for RPN stack operations
+- Integration tests for UI interactions
+- Accessibility compliance tests
+- Performance tests to ensure <100ms operations
+
+## Recent Changes
+- 001-build-a-single: Added HTML5, CSS3, JavaScript ES6+ (vanilla, no build step) + None (pure HTML/CSS/JS, zero dependencies as per constitution)
+- 001-build-a-single: Initial calculator implementation with standard and RPN modes
+- 001-build-a-single: Keyboard-first operation with command palette