chore: import upstream snapshot with attribution

README.dev.md

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+# Developer Guide
+
+**📍 This file has moved!**
+
+Developer documentation now lives in the development docs structure.
+
+👉 **[Read the Development Setup Guide](docs/7-DEVELOPMENT/development-setup.md)**
+
+---
+
+## Quick Links
+
+- **Setting up your environment?** → [Development Setup](docs/7-DEVELOPMENT/development-setup.md) (includes the make-workflow matrix)
+- **New developer?** → [Quick Start](docs/7-DEVELOPMENT/quick-start.md)
+- **Want to contribute?** → [Contributing Guide](docs/7-DEVELOPMENT/contributing.md)
+- **Making a common change?** → [Change Playbooks](docs/7-DEVELOPMENT/change-playbooks.md)
+- **Publishing Docker images?** → [Release Process](.github/RELEASE_PROCESS.md)
+- **Coding-agent rules?** → [AGENTS.md](AGENTS.md)
+
+---
+
+## TL;DR
+
+```bash
+git clone https://github.com/lfnovo/open-notebook.git && cd open-notebook
+cp .env.example .env
+uv sync
+make start-all    # SurrealDB + API + worker + frontend
+```
+
+For everything else, see **[docs/7-DEVELOPMENT/](docs/7-DEVELOPMENT/index.md)**.