Allow users to define a markdown file (e.g., AGENTS.md) that Lumo reads automatically at session start, providing global context like tech stack, coding standards, infrastructure constraints, and behavioral rules. This would:
- Eliminate repetitive manual context-pasting per session
- Work across all conversations (not project-scoped)
- Support version-controlled configuration (Git repos)
- Align with emerging AGENTS.md standard used by other AI tools (Junie AI, GitHub Copilot, Aider, Gemini CLI)

Free-tier compatible since it doesn't require persistent storage — just file parsing at session start. File could be stored on Proton Drive.