Revamp README for internal devs

Co-authored-by: Claude Code <claude@anthropic.com>

README.md

@@ -1,19 +1,32 @@
 # Sauci
 
-A couples intimacy app featuring swipeable question packs with partner matching.
+![Node 20+](https://img.shields.io/badge/node-20%2B-339933)
+![npm 10+](https://img.shields.io/badge/npm-10%2B-CB3837)
+![Turborepo](https://img.shields.io/badge/monorepo-turborepo-0F1115)
 
-## Project Structure
+Sauci is a couples intimacy app where partners swipe question packs, match on shared interests, and chat about what they unlock together.
+
+## What lives here
 
 ```
 sauci/
 ├── apps/
 │   ├── mobile/     # Expo React Native app
-│   ├── admin/      # React Admin dashboard
+│   ├── admin/      # Admin dashboard (Vite + React)
+│   ├── web/        # Marketing website (Next.js)
 │   └── supabase/   # Supabase project (migrations, edge functions)
 ├── packages/
 │   └── shared/     # Shared TypeScript types
 ```
 
+## Core product flows
+
+- **Couple pairing** via invite codes and profile linking
+- **Question packs** with two-part phrasing and smart selection bias
+- **Matches + chat** when both partners answer positively
+- **Notifications** for new matches and messages
+- **Subscriptions** via RevenueCat with couple-level premium sharing
+
 ## Prerequisites
 
 - Node.js 20+
@@ -21,19 +34,57 @@ sauci/
 - Supabase CLI (`npm install -g supabase`)
 - Expo CLI (`npm install -g expo-cli`)
 
-## Getting Started
+## Quickstart
 
 ```bash
-# Install dependencies
 npm install
-
-# Start development
 npm run dev
 ```
 
-## Tech Stack
+## App commands
+
+From each app directory:
+
+- **Mobile** (`apps/mobile`): `npm run dev`, `npm run ios`, `npm run android`, `npm run web`
+- **Admin** (`apps/admin`): `npm run dev`, `npm run build`, `npm run typecheck`
+- **Web** (`apps/web`): `npm run dev`, `npm run build`, `npm run start`
+
+## Environment setup
+
+Copy the example files and fill in values:
+
+- Mobile: `apps/mobile/.env.example`
+- Admin: `apps/admin/.env.example`
+- Web: `apps/web/.env.local.example`
+
+## Supabase (local)
+
+- Config lives in `apps/supabase/config.toml`.
+- Use the Supabase CLI for local services and migrations.
+
+## Scripts (root)
+
+- `npm run dev` - run all apps in dev mode
+- `npm run build` - build all apps
+- `npm run lint` - lint all apps
+- `npm run typecheck` - typecheck all apps
+- `npm run clean` - clean build artifacts
+
+## Docs
+
+- Auth: `docs/authentication.md`
+- Schema: `docs/schema.md`
+- Pairing: `docs/couple-pairing.md`
+- Questions: `docs/question-selection.md`
+- Matches/notifications: `docs/match-notifications.md`
+- Subscriptions: `docs/subscription-system.md`
+- Mobile release guide: `apps/mobile/RELEASING.md`
+
+## Tech stack
 
 - **Mobile**: Expo (React Native)
-- **Backend**: Supabase Cloud (PostgreSQL, Auth, Edge Functions, Realtime)
-- **Admin**: React Admin
+- **Backend**: Supabase (Postgres, Auth, Edge Functions, Realtime)
+- **Admin**: React + Vite
+- **Web**: Next.js
 - **Monorepo**: Turborepo
+