v4.0.0

What’s changed

🚨 Breaking changes

• Fix FreshWaterIQ installed detection and normalize sentinel readings @Moustachauve (#23)
• Normalize unavailable heating modes to HeatingMode.UNKNOWN @Moustachauve (#26)

📚 Documentation

• Add AGENTS.md and CONTRIBUTING.md with contributor and PR label guidelines @Moustachauve (#24)

⬆️ Dependency updates

• Remove unused awesomeversion and python-backoff dependencies @Moustachauve (#25)