fix: Cleanup Claude setup and move to agent agnostic setup

Author: schnaitter

.claude/settings.local.json

@@ -130,3 +130,6 @@ _build
 
 # macos
 .DS_Store
+
+# Claude
+.claude

.gitignore

@@ -0,0 +1,169 @@
+# AGENTS.md
+
+This file provides guidance to coding agents when working with
+code in this repository.
+
+## Project Overview
+
+**Selbstlernkurs Python** - A self-learning Python course for library and
+information science students at Humboldt-Universität zu Berlin. The course uses
+MyST Markdown and Jupyter Book to create an interactive learning environment.
+
+**Target Audience**: Master's students in Library and Information Science
+(distance learning program)
+
+**Course Structure**: Project-based learning with library/information science
+use cases (CSV processing, MARC-XML metadata, Excel statistics)
+
+## Repository Architecture
+
+### Chapter Organization
+
+Numbered directories represent sequential course modules:
+
+- `000-Einleitung/` - Introduction and course usage
+- `010-Installation_Technik/` - Python installation and setup
+- `020-Projekt_Taschenrechner_I/` - Calculator project I (basic concepts)
+- `030-Exkurs_Unix/` - Unix command line excursion
+- `040-Projekt_CSV_I/` - CSV file processing
+- `045-Projekt_Taschenrechner_II/` - Calculator project II (input, loops)
+- `050-Exkurs_Git/` - Git version control excursion
+- `060-Projekt_CSV_II/` - Advanced CSV processing
+- `070-Projekt_MARC-XML/` - Library metadata processing
+- `080-Projekt_Excel/` - Excel file processing
+- `900-Cheatsheet.md` - Quick reference
+- `999-Epilog/` - Glossary, index, literature, imprint
+
+### Key Directories
+
+- `solutions/` - Solution scripts for exercises (e.g.,
+  `solutions/020/taschenrechner.py`)
+- `_build/` - Generated build output (do not edit manually)
+- `.venv/` - Python virtual environment (Python 3.13+)
+- `assets/` - Images, logos, and static files
+
+### Content Format
+
+Each chapter contains:
+
+- `.ipynb` files - Interactive Jupyter notebooks with executable code
+- `.md` files - MyST Markdown documentation
+- Learning objectives (🎓 Lernziele) at the start
+- Exercises that qualify as "Kleine Aufgabe" course assignments
+
+Content is in German using gender-neutral language with asterisks (e.g.,
+"Lernende\*r")
+
+## Common Development Commands
+
+### Environment Setup
+
+```bash
+# Activate virtual environment (automatic with direnv via .envrc)
+source .venv/bin/activate
+
+# Install/update dependencies
+pip install -r requirements.txt
+```
+
+**Dependencies** (Python 3.13+):
+
+- `jupyter-book==2.0.0b3` ⚠️ Beta version - may have unstable APIs
+- `jupyterlab`, `ipywidgets`, `jupyterquiz`, `numpy`
+
+### Building and Testing
+
+```bash
+# Build the complete MyST book (outputs to _build/)
+jupyter book build --execute --all
+
+# Start JupyterLab for editing notebooks
+jupyter lab
+# or: .venv/bin/jupyter lab
+
+# Run solution scripts
+./solutions/020/taschenrechner.py
+# or: python3 solutions/020/taschenrechner.py
+```
+
+## Key Technical Details
+
+### MyST Book Configuration (`myst.yml`)
+
+- **Project ID**: `009c9d71-a4fc-4438-8118-31289551ac9b`
+- **Template**: `book-theme` with custom logo/favicon in `assets/`
+- **Table of Contents**: Defined in `toc.yml` with hierarchical chapter
+  structure
+- **Jupyter Integration**:
+    - Jupyter Lite enabled (browser-based Python execution)
+    - Binder integration (cloud-based interactive notebooks via mybinder.org)
+- **License**: CC-BY-4.0 (content) / MIT (code)
+- **Bibliography**: `bibliography.bib` for citations
+
+### Adding New Content
+
+When adding chapters or sections:
+
+1. Create files in the appropriate numbered directory (e.g.,
+   `040-Projekt_CSV_I/`)
+2. Update `toc.yml` to include the new file in the navigation hierarchy
+3. Follow MyST frontmatter conventions for metadata:
+    ```yaml
+    ---
+    short_title: Title
+    numbering:
+        heading_1: true
+        heading_2: true
+        title: true
+    ---
+    ```
+4. Use margin notes for hints: `:::::{margin} ... :::::`
+5. Include learning objectives (🎓 Lernziele) at the start of chapters
+
+### Jupyter Notebooks
+
+- Use MyST markdown cells (not plain markdown) for rich formatting
+- Include interactive Python examples with expected outputs
+- Use `jupyterquiz` for in-notebook quizzes and exercises
+- Notebooks support Mermaid diagrams for visualizations
+- Comment syntax: `# Comment text` (everything after `#` is ignored)
+
+### Python Solution Scripts
+
+Pattern for solution files (see `solutions/020/taschenrechner.py`):
+
+- Include shebang: `#! /usr/bin/env python3`
+- Make executable: `chmod +x script.py`
+- Follow PEP 8 style guidelines
+- Use `if __name__ == "__main__":` for executable logic
+
+### Language and Style
+
+**German content with specific conventions**:
+
+- Gender-neutral asterisks: "Lernende\*r", "Bibliothekswissenschaftler\*innen"
+- German terms with English in parentheses: "Versionskontrolle (Version
+  Control)"
+- File/folder names may include umlauts: `Dateien_öffnen.ipynb`
+- Decimal numbers: German text style in prose, Python dot notation in code
+
+### Pedagogical Structure
+
+**Project-based, incremental learning**:
+
+- **Iterative complexity**: Projects revisited with added features (e.g.,
+  `Taschenrechner` I & II)
+- **Domain-specific context**: All examples use library/information science
+  data
+- **Self-paced design**: Students can skip ahead or follow linear progression
+- **Mixed formats**: Notebooks (hands-on), Markdown (theory), Excursions
+  (context)
+
+## Development Notes
+
+- **Never edit `_build/`** - regenerated on each build
+- **Ignore `.ipynb_checkpoints/`** - Jupyter autosave artifacts
+- **Beta warning**: `jupyter-book==2.0.0b3` may have breaking changes in
+  updates
+- **Binder deployment**: Changes to main branch automatically available in
+  cloud environment