docs: Update version numbering to semantic versioning (Rev. 0.0/0.1)

- Rename Rev. 0 to Rev. 0.0 (initial release)
- Rename Rev. 1 to Rev. 0.1 (major hardware upgrade)
- Update all documentation (README and CHANGELOG files)
- Create new git tags with proper semantic versioning

CHANGELOG.md

@@ -0,0 +1,68 @@
+# 📝 Changelog
+
+*🇩🇪 Deutsche Version: [CHANGELOG.de.md](CHANGELOG.de.md)*
+
+All notable changes to the Laser CANbus Toolhead PCB project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html) for hardware revisions.
+
+## [Unreleased]
+
+## [Rev. 0.1] - 2025-11-26
+
+### 🔧 Hardware Changes
+- **Transistor Upgrade:** Replaced MOSFET with CJAC70P06 (60V voltage rating, improved safety margin)
+- **Sensor Upgrade:** Changed from ADXL345 to ICM-20602 (better availability, modern 6-axis IMU with gyroscope)
+- **Connector Change:** Micro Fit 3.0 connectors changed from SMD to THT mounting for better mechanical stability
+
+### 🎨 Design Improvements
+- **Silkscreen Enhancement:** Added connector pin assignments to silkscreen for easier assembly and debugging
+- **Layout Optimization:** Cleaned up component placement and optimized routing for better signal integrity
+- **Documentation:** Updated overview image to reflect current design
+
+### 📋 Documentation & Production
+- **BOM Update:** Added component order numbers for easier procurement
+- **Production Files:** Updated assembly and production files with current components
+- **Documentation:** Added comprehensive changelog and table of contents to README files
+- **Language Support:** Improved documentation structure with proper language links
+
+### 🔌 Electrical Specifications
+- **Voltage Rating:** Improved to 60V (CJAC70P06 vs. previous AO4407A)
+- **Current Handling:** Maintained 6A continuous, 8A peak capability
+- **Sensor Capability:** Upgraded to 6-axis motion sensing (accelerometer + gyroscope)
+
+## [Rev. 0.0] - 2025-11-25
+
+### 🚀 Initial Release
+- **Microcontroller:** STM32F072CBU6 (Cortex-M0, 48MHz, CAN-capable)
+- **CAN-Bus Communication:** SN65HVD230 transceiver with ESD protection
+- **Laser Power Control:** 24V/4A control with AO4407A MOSFET
+- **Input Shaping:** ADXL345 accelerometer for Klipper resonance measurement
+- **Power Supply:** MP2459 buck converter (24V to 5V) and XC6206 LDO (5V to 3.3V)
+- **Safety Features:** Hardware pull-down, TVS protection, PTC fuse
+- **Diagnostics:** Multiple status LEDs for system monitoring
+
+### 🔧 Features
+- Klipper-compatible firmware support
+- CAN-Bus communication at 1 Mbit/s
+- Hardware PWM for laser control
+- Split termination via solder jumper
+- Soft-start circuit for laser power
+- Debug/programming header for development
+
+---
+
+## 📊 Version Comparison
+
+| Feature | Rev. 0.0 | Rev. 0.1 |
+|---------|----------|----------|
+| **MOSFET** | AO4407A | CJAC70P06 (60V) |
+| **Sensor** | ADXL345 (3-axis) | ICM-20602 (6-axis) |
+| **Connectors** | SMD | THT |
+| **Voltage Rating** | Standard | 60V Enhanced |
+| **Silkscreen** | Basic | Enhanced with pinouts |
+
+---
+
+*For technical documentation, see [README.md](README.md)*