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

docs/tech/stack.md

@@ -0,0 +1,52 @@
+---
+description: >-
+  Detailed inventory of the core software stack, OS context, and maintenance
+  policies for the mw-pfeddersheim-workstation.
+tags:
+  - software-stack
+  - inventory
+  - tech-stack
+last_updated: '2026-03-09'
+---
+
+# Software Stack - mw-pfeddersheim-workstation
+
+## Core Development Environment
+
+| Technology | Version | Description |
+|------------|---------|-------------|
+| **Node.js** | 25.6.1 | Primary JavaScript/TypeScript runtime |
+| **Python** | 3.14.3 | Secondary scripting and AI automation language |
+| **PHP** | 8.5.3 (CLI) | Legacy and ERP integration language |
+| **Ansible** | 2.20.2 (core) | Infrastructure provisioning and configuration |
+| **Docker** | 29.2.1 | Containerization and environment isolation |
+| **Git** | latest | Version control |
+| **ripgrep** | latest | Fast line-oriented search tool (`rg`) |
+| **bat** | latest | A `cat` clone with syntax highlighting |
+| **rustdesk** | latest | Remote management via Tailscale |
+
+## OS Context
+- **OS**: Linux (Manjaro/Arch Linux based)
+- **Architecture**: x86_64
+
+## Maintenance Policies
+- **Updates**: System-wide updates via `pacman` managed through maintenance scripts.
+- **Node.js**: Global packages managed via `pnpm`.
+- **Python**: Use `uv` for environment management.
+- **PHP**: Managed via system package manager, focused on CLI execution.
+
+## Tool Path Summary
+- **Ansible**: `/usr/bin/ansible`
+- **Python**: `/usr/bin/python`
+- **Docker**: `/usr/bin/docker`
+
+## Deprecated Software (Pending Cleanup)
+
+### Microsoft Visual Studio Code (Status: Removed)
+VS Code has been decommissioned from this workstation.
+
+| Type | Status | Notes |
+|------|--------|-------|
+| **Package** | Removed | `vscode` not present in `pacman -Qet` |
+| **Config** | Removed | `~/.vscode-oss` directory deleted |
+| **Application Data** | Removed | `~/.config/Code - OSS/` directory deleted |