chore: init CLAUDE.md

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.
+
+## Project Overview
+
+Fail Well is a Progressive Web App (PWA) for tracking developer feedback loops during coding tasks. It helps compare planned steps/time vs actual execution, promoting iterative improvement.
+
+## Commands
+
+```bash
+# Development
+pnpm dev                    # Start Vite dev server
+
+# Building
+pnpm build                  # Full build (types + tests + bundle)
+pnpm build-only             # Vite build only
+
+# Testing
+pnpm test                   # Full test suite (lint + types + unit)
+pnpm test:unit              # Vitest unit tests only
+pnpm test:ui                # Vitest with UI dashboard
+pnpm test:types             # TypeScript type checking
+
+# Code Quality
+pnpm lint                   # ESLint with auto-fix
+pnpm format                 # Prettier formatting
+
+# Commits
+pnpm commit                 # Commitizen conventional commit prompt
+```
+
+## Architecture
+
+**Tech Stack:** Vue 3 + TypeScript + Vite + Pinia + Bulma CSS
+
+**Module Structure:**
+
+- `src/modules/` - Feature modules with self-contained components, stores, models, and services
+  - `record/` - Task execution tracking (time, steps, break calculation)
+  - `task/` - Task CRUD, step history, duplication
+  - `step/` - Step-related components
+- `src/views/` - Page-level components organized by feature
+- `src/shared/` - Shared types and hooks
+- `src/router/` - Vue Router configuration
+
+**State Management:** Pinia stores with `pinia-plugin-persistedstate` for local persistence
+
+**Key Routes:**
+
+- `/` - Task list
+- `/task/:id` - Task details
+- `/task/:id/edit` - Edit steps
+- `/task/:taskId/record` - Record task execution
+
+## Testing
+
+Uses Vitest with jsdom environment. Test files are colocated with source files using `.spec.ts` suffix.
+
+Run single test file: `pnpm vitest run path/to/file.spec.ts`