docs: align with satware AG best practices

- Delete deprecated CLAUDE.md
- Create root-level AGENTS.md for AI assistant guidance
- Create SDD constitution in .specify/memory/constitution.md
- Align documentation with PARA structure (docs/product/project-brief.md, docs/tech/stack.md, docs/plans/)
- Add standardized YAML frontmatter to all documentation files
- Update README.md with saTway branding and structure

AGENTS.md

@@ -0,0 +1,32 @@
+# AGENTS.md (mw-pfeddersheim-workstation)
+
+## Project Overview
+This repository manages the infrastructure, configuration, and maintenance for Michael Wegener's primary workstation at satware AG (Pfeddersheim location). It uses Ansible for system configuration and shell scripts for maintenance.
+
+## Key Directories
+- `ansible/`: Configuration-as-Code via Ansible roles and playbooks.
+- `docs/`: PARA-structured documentation (Product, ADR, Learnings, Tech).
+- `scripts/`: Automation and maintenance scripts.
+- `config/`: Templates for system configuration files.
+
+## Essential Commands
+| Task | Command |
+|------|---------|
+| Apply Configuration | `ansible-playbook ansible/workstation.yml` |
+| System Maintenance | `bash scripts/maintenance.sh` |
+| Verify Ansible | `ansible-playbook ansible/workstation.yml --check` |
+
+## Standards
+- **Baby Steps™**: Small, verifiable changes (<200 LOC per commit).
+- **PARA Documentation**: Keep documentation updated in the `docs/` folder.
+- **Zero-Trust**: Secrets must be handled via Ansible Vault or environment variables.
+
+## Guardrails
+- **NEVER** commit raw secrets to the repository.
+- **ALWAYS** run Ansible with `--check` before applying changes.
+- **NEVER** modify system configuration directly if it can be managed via Ansible.
+
+## Rules Hierarchy
+- Global rules: `Rules/`
+- Project rules: `.clinerules/`
+- Agent instructions: `AGENTS.md` (this file)