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CLAUDE.md

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+# CLAUDE.md
+
+This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
+
+## Version Control
+
+This project uses **Jujutsu (jj)** instead of git for version control. Key differences:
+- Use `jj` commands instead of `git` commands
+- Every change creates a new revision automatically
+- Working copy is separate from the revision graph
+- Common commands:
+  - `jj status` - check working copy status
+  - `jj log` - view revision history
+  - `jj new` - create new revision
+  - `jj describe` - add/edit commit message
+  - `jj squash` - move changes from working copy to parent revision
+
+## Project Overview
+
+Captain's Log is a GTD-inspired personal task management system designed to minimize cognitive overhead while maximizing productivity through context-aware task organization.
+
+**Core Philosophy**: Capture everything without thinking, see only what matters right now, work efficiently within your current context.
+
+## Technical Architecture
+
+### Backend: Rust + Axum + SQLx
+- **Framework**: Axum for high-performance HTTP server
+- **Database**: SQLx for type-safe database interactions
+- **Dev Database**: SQLite for easy setup and portability
+- **Production Database**: PostgreSQL for scalability
+- **Authentication**: Simple session-based auth (single user)
+
+### Frontend: Vite + React + Tailwind CSS
+- **Build Tool**: Vite for fast development and optimized builds
+- **Framework**: React with functional components and hooks
+- **Routing**: React Router for client-side navigation
+- **Styling**: Tailwind CSS for rapid UI development
+- **State Management**: React state with localStorage persistence
+- **PWA Features**: Service worker for offline functionality
+- **Mobile Optimization**: Touch gestures, responsive design
+
+### Core Data Models
+```sql
+-- Tasks (Phase 1 MVP)
+tasks (id, title, description, priority, due_date, status, created_at, updated_at, completed_at)
+
+-- Future phases will add:
+-- projects (id, name, description, color, status, created_at, updated_at)
+-- contexts (id, name, description, color, icon)
+-- task_contexts (task_id, context_id)
+-- recurring_patterns (id, task_id, pattern_type, interval_value, days_of_week, monthly_type)
+```
+
+## Development Commands
+
+### Testing
+```bash
+# Backend tests
+cargo test
+cargo tarpaulin --out Html  # Coverage report
+
+# Frontend tests  
+npm test                    # Unit tests
+npm run test:e2e           # End-to-end tests
+npm run test:coverage      # Coverage report
+```
+
+### Development Server
+```bash
+# Backend (Rust server)
+cargo run
+
+# Frontend (Vite dev server) 
+npm run dev
+```
+
+## Current Phase: Core MVP
+
+**Focus**: Basic task management with CRUD operations
+- Task properties: title, description, priority, due_date, status
+- Simple web interface with mobile responsiveness
+- Testing framework setup with >80% backend coverage target
+- RESTful API endpoints for all task operations
+
+See `/plan/01_CORE_MVP/plan.md` for detailed implementation plan.
+
+## Future Phases
+
+1. **Phase 2**: Context tagging system (@computer, @phone, @errands, etc.)
+2. **Phase 3**: Project organization and hierarchical structure
+3. **Phase 4**: Smart views and anti-overwhelm features
+4. **Phase 5**: Recurring tasks and advanced scheduling
+5. **Phase 6**: PWA features and offline capability