Merge main into dev: Resolve conflicts keeping brownfield-first positioning

- Kept brownfield-first description in pyproject.toml
- Kept test mode detection in sync.py
- Kept all brownfield-first documentation changes
- Resolved conflicts in favor of dev branch (new positioning)

Author: Dominikus Nold

docs/examples/dogfooding-specfact-cli.md

@@ -3,6 +3,8 @@
 > **TL;DR**: We ran SpecFact CLI on its own codebase. It discovered **19 features** and **49 stories** in **under 3 seconds**. When we compared the auto-derived plan against our manual plan, it found **24 deviations** and blocked the merge (as configured). Total time: **< 10 seconds**. 🚀
 > **Note**: "Dogfooding" is a well-known tech term meaning "eating your own dog food" - using your own product. It's a common practice in software development to validate that tools work in real-world scenarios.
 
+> **Note**: "Dogfooding" is a well-known tech term meaning "eating your own dog food" - using your own product. It's a common practice in software development to validate that tools work in real-world scenarios.
+
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 ## The Challenge