Add comprehensive documentation for Bitpoll Nix Flake, including memory bank, project brief, product context, active context, progress, system patterns, tech context, and usage guidelines.

memory-bank/README.md

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+# Memory Bank: Bitpoll Nix Flake
+
+This memory bank contains comprehensive documentation for the Bitpoll Nix flake project. These files serve as the complete context for understanding and working with this project.
+
+## File Structure
+
+### Core Files (Required)
+1. **`projectbrief.md`** - Foundation document defining project scope, requirements, and success criteria
+2. **`productContext.md`** - Why the project exists, problems it solves, and user experience goals
+3. **`systemPatterns.md`** - Technical architecture, design patterns, and implementation details
+4. **`techContext.md`** - Technology stack, dependencies, tools, and technical constraints
+5. **`activeContext.md`** - Current work focus, recent changes, decisions, and project insights
+6. **`progress.md`** - What works, what's left to build, current status, and future roadmap
+
+## Project Summary
+
+**Bitpoll Nix Flake** is a comprehensive packaging solution that brings the Bitpoll Django web application to the Nix ecosystem. It provides:
+
+- **Complete Nix Package**: Builds Bitpoll with all dependencies
+- **NixOS Service Module**: Production-ready systemd service with security hardening
+- **Cross-platform Support**: Development on macOS, deployment on Linux
+- **Security-first Design**: Comprehensive security measures built-in
+- **Production Ready**: Automatic migrations, static file management, and proper data persistence
+
+## Current Status: PRODUCTION READY ✅
+
+The project is **complete and functional** with all core requirements met:
+- Package builds successfully
+- NixOS service works reliably
+- Security hardening implemented
+- Documentation comprehensive
+- Ready for production deployment
+
+## Key Technical Decisions
+
+1. **Hybrid Dependency Strategy**: nixpkgs packages + pip for comprehensive coverage
+2. **Build-time Configuration**: Generated settings with runtime overrides
+3. **Security-first Design**: Dedicated user with systemd hardening
+4. **Single Data Directory**: `/var/lib/bitpoll` for easy backup/restore
+
+## Usage Quick Reference
+
+```bash
+# Build package
+nix build
+
+# Run development server
+nix run
+
+# Management commands
+nix run .#bitpoll-manage -- migrate
+
+# Development environment
+nix develop
+
+# NixOS deployment
+services.bitpoll.enable = true;
+```
+
+## Memory Bank Usage
+
+When working on this project:
+
+1. **Start by reading ALL memory bank files** - they build upon each other
+2. **Update activeContext.md** when making significant changes
+3. **Update progress.md** when completing features or fixing issues
+4. **Maintain other files** when architecture or requirements change
+
+The memory bank ensures continuity and context preservation across development sessions.
+
+---
+
+*Last Updated: January 7, 2025*
+*Project Status: Production Ready*
+*Memory Bank Version: 1.0*