chore: import upstream snapshot with attribution

docs/agent/quickstart.md

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+# Quickstart Guide
+
+> Essential commands to build, run, and test Resume Matcher.
+
+## Prerequisites
+
+- Node.js 22+
+- Python 3.13+
+- [uv](https://docs.astral.sh/uv/) (Python package manager)
+
+## Installation
+
+```bash
+# Backend (from repo root)
+cd apps/backend
+uv sync
+
+# Frontend (from repo root)
+cd apps/frontend
+npm install
+```
+
+## Development
+
+```bash
+# Backend (Terminal 1, from repo root)
+cd apps/backend
+uv run uvicorn app.main:app --reload --port 8000
+
+# Frontend (Terminal 2, from repo root)
+cd apps/frontend
+npm run dev
+```
+
+## Quality Checks
+
+```bash
+# From apps/frontend
+npm run lint     # Lint frontend
+npm run format   # Prettier
+```
+
+## Backend Commands
+
+```bash
+cd apps/backend
+uv run uvicorn app.main:app --reload --port 8000
+uv run pytest
+```
+
+## Environment Setup
+
+```bash
+# Backend
+cp apps/backend/.env.example apps/backend/.env
+
+# Frontend
+cp apps/frontend/.env.sample apps/frontend/.env.local
+```
+
+## First-Time Setup
+
+1. Open http://localhost:3000/settings
+2. Select AI provider + enter API key
+3. Click "Test Connection"
+4. Upload your first resume!