[beginwebdev2002]

Transformed descriptive text into structural visuals to eliminate ambiguity across multiple markdown files.

• agents.md: Added a mermaid graph LR to visualize the 4-step execution loop.
• docs/windsurf-vibe-coding-hints.md: Added a mermaid graph LR to visualize the 3-step vibe coding hints sequence.
• architectures/event-sourcing/folder-structure.md: Added a mermaid classDiagram using composition to represent the directory hierarchy.
• backend/nestjs/readme.md: Added a markdown table to structurally compare "Fat Controllers vs Thin Controllers".
  All visuals strictly adhere to the requested design tokens and valid mermaid syntax.

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PR created automatically by Jules for task 3679155979171283026 started by @beginwebdev2002

[google-labs-jules]

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