Write, Run, Debug — REslava.Result three-layer...

Pipeline diagrams generated at compile time are great for understanding structure. But structure tells you what could happen — not what did happen. That's where runtime observation comes in. REslava.Result has a three-layer story: ✏️ Write — add [ResultFlow] to any fluent Result method. The source generator emits a Mermaid diagram constant at compile time. You can paste it into GitHub, Notion, VS Code, or mermaid.live and see the entire pipeline shape before you ever run it. ▶️ Run — make your c