[WIP] Add reflect and retrospect functionality

[Copilot]

• Create REFLECTION.md document with project retrospective
• Include sections on the journey from 2.x to 3.0
• Document lessons learned during the rewrite
• Reflect on architectural decisions
• Discuss challenges overcome
• Share insights for future development
• Provide perspective on the team's growth
• Conclude with forward-looking vision

Original prompt

reflect and retrospect

---

✨ Let Copilot coding agent set things up for you — coding agent works faster and does higher quality work when set up for your repo.

[Copilot]

Copilot wasn't able to review any files in this pull request.

---

_{Tip: Customize your code reviews with copilot-instructions.md. Create the file or learn how to get started.}