Build Mermaid diagrams (flowchart, sequence, state, ER, class). Paste the output into GitHub README, Notion, or any Mermaid-compatible viewer.
```mermaid
flowchart TD
A[Start] --> B{Decision}
B -->|Yes| C[Action 1]
B -->|No| D[Action 2]
C --> E[End]
D --> E
```flowchart TD
A[Start] --> B{Decision}
B -->|Yes| C[Action 1]
B -->|No| D[Action 2]
C --> E[End]
D --> E