docs: upgrade README, add CI pipeline (#2)

Add tech badges, tech stack table, build section with chunk sizes,
updated changelog (v5.5 → v7.4.1), cloud sync and multi-location
features. Add basic GitHub Actions CI (build on push/PR).
Fix clone URL and Node version requirement.

Author: claygeo

.github/workflows/ci.yml

@@ -0,0 +1,25 @@
+name: CI
+
+on:
+  push:
+    branches: [master]
+  pull_request:
+    branches: [master]
+
+jobs:
+  build:
+    name: Build
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-node@v4
+        with:
+          node-version: 18
+          cache: npm
+
+      - name: Install dependencies
+        run: npm ci
+
+      - name: Build
+        run: npm run build

README.md

@@ -1,10 +1,20 @@
 # Cannabis Inventory Management System
 
-A comprehensive React-based web application designed for cannabis inventory tracking, barcode scanning, and thermal label generation. The system supports multiple data sources, automatic allergen detection, and production-ready label printing optimized for Zebra ZT610 thermal printers.
+[![React](https://img.shields.io/badge/React-18-61DAFB?logo=react&logoColor=white)](https://reactjs.org/)
+[![Vite](https://img.shields.io/badge/Vite-5-646CFF?logo=vite&logoColor=white)](https://vitejs.dev/)
+[![Tailwind](https://img.shields.io/badge/Tailwind-3.4-06B6D4?logo=tailwindcss&logoColor=white)](https://tailwindcss.com/)
+[![Supabase](https://img.shields.io/badge/Supabase-PostgreSQL-3ECF8E?logo=supabase&logoColor=white)](https://supabase.com/)
+[![CI](https://github.com/claygeo/cannabis-inventory-system/actions/workflows/ci.yml/badge.svg)](https://github.com/claygeo/cannabis-inventory-system/actions/workflows/ci.yml)
+[![License](https://img.shields.io/badge/License-MIT-green)](LICENSE)
+
+A production React application for cannabis inventory tracking, barcode scanning, and thermal label generation. Handles multi-source CSV/Excel imports, automatic allergen detection, and Zebra ZT610-optimized label printing at 203 DPI. Cloud-synced master product list via Supabase with offline localStorage fallback.
+
+Running in production since 2024. Currently at v7.4.1.
 
 ## Table of Contents
 
 - [Features](#features)
+- [Tech Stack](#tech-stack)
 - [Prerequisites](#prerequisites)
 - [Setup](#setup)
 - [Environment Configuration](#environment-configuration)
@@ -13,6 +23,7 @@ A comprehensive React-based web application designed for cannabis inventory trac
 - [Label Generation](#label-generation)
 - [Thermal Printer Configuration](#thermal-printer-configuration)
 - [Development](#development)
+- [Build](#build)
 - [Production Deployment](#production-deployment)
 - [Security Notes](#security-notes)
 
@@ -29,12 +40,31 @@ A comprehensive React-based web application designed for cannabis inventory trac
 - **Responsive Dark UI**: Modern dark theme optimized for warehouse environments
 - **Label Preview**: Live preview of labels before printing
 - **Calibration Tools**: Printer alignment testing and calibration utilities
+- **Master List Cloud Sync**: Supabase-backed product list with 1000+ record pagination
+- **Unmapped Product Admin**: Override system for unrecognized products with remap history
+- **Multi-Location Support**: HSTD (horizontal) and MTD (vertical) label formats
+- **Version-Aware State**: Automatic cache invalidation on app updates
+
+---
+
+## Tech Stack
+
+| Layer | Technology |
+|-------|------------|
+| Frontend | React 18, React Router 6 |
+| Build | Vite 5 |
+| Styling | Tailwind CSS 3.4 (custom dark theme, 400+ lines) |
+| Labels | jsPDF (PDF generation), JsBarcode (Code 39) |
+| Data Import | PapaParse (CSV), SheetJS (Excel) |
+| Cloud Sync | Supabase (PostgreSQL, master product list) |
+| Printer | Zebra Browser Print SDK (ZPL generation) |
+| Hosting | Netlify (SPA routing, security headers, asset caching) |
 
 ## Prerequisites
 
 Before setting up the project, ensure you have the following:
 
-- **Node.js (v16+) and npm**: Install from [nodejs.org](https://nodejs.org)
+- **Node.js (v18+) and npm**: Install from [nodejs.org](https://nodejs.org)
 - **Modern Web Browser**: Chrome, Firefox, Safari, or Edge
 - **Zebra ZT610 Thermal Printer** (optional): For physical label printing
 - **Label Stock**: 4" × 6" thermal labels compatible with Zebra ZT610
@@ -47,7 +77,7 @@ Follow these steps to set up the project locally:
 ### 1. Clone the Repository
 
 ```bash
-git clone https://github.com/your-username/cannabis-inventory-system.git
+git clone https://github.com/claygeo/cannabis-inventory-system.git
 cd cannabis-inventory-system
 ```
 
@@ -209,16 +239,6 @@ src/
 └── constants.js        # Application constants
 ```
 
-### Key Technologies
-
-- **React 18+**: Modern React with hooks and context
-- **Vite**: Fast build tool and dev server
-- **Tailwind CSS**: Utility-first CSS framework
-- **React Router**: Client-side routing
-- **jsPDF**: PDF generation for labels
-- **Papa Parse**: CSV processing
-- **SheetJS**: Excel file processing
-
 ### Development Scripts
 
 ```bash
@@ -228,6 +248,26 @@ npm run preview  # Preview production build
 npm run lint     # Run ESLint
 ```
 
+---
+
+## Build
+
+Production build via Vite with manual chunk splitting for optimal caching.
+
+| Chunk | Raw | Gzip |
+|-------|-----|------|
+| react | 141 KB | 45 KB |
+| utils (papaparse, jsbarcode, jspdf, xlsx) | 872 KB | 281 KB |
+| html2canvas | 201 KB | 48 KB |
+| app code | 482 KB | 118 KB |
+| router | 21 KB | 8 KB |
+| ui (lucide, toast) | 22 KB | 8 KB |
+| CSS | 101 KB | 14 KB |
+
+CI pipeline runs on every push and PR to master: `npm ci` and `npm run build`.
+
+---
+
 ## Production Deployment
 
 ### Environment Setup
@@ -329,8 +369,15 @@ For support and questions:
 
 ## Changelog
 
-### Version 5.5.0
-- Added environment variable configuration
-- Improved security for credential management
+### v7.4.1
+- Unmapped products admin dashboard with remap history
+- Fix dark theme consistency on admin pages
+
+### v7.3.0
+- Supabase cloud sync for master product list
+- Pagination support for 1000+ products
+- Auto-fix strain placeholder with actual strain data
+
+### v5.5.0
+- Environment variable configuration for credentials
 - Enhanced documentation and setup process
-- Updated authentication system with fallbacks