[beginwebdev2002]

This PR injects 5 Mermaid class diagrams, graph workflows, and structural comparison tables into markdown files to enforce zero-approve visual generation mandates.

Files updated:

1. frontend/javascript/clean-code.md: Injected a structural comparison table showing x === true vs truthy evaluation.
2. architectures/backend-for-frontend/trade-offs.md: Injected a Mermaid LR graph showing the BFF lifecycle.
3. architectures/event-sourcing/folder-structure.md: Injected a Mermaid classDiagram showing composition (*--).
4. architectures/micro-frontends/folder-structure.md: Injected a Mermaid classDiagram showing composition (*--).
5. architectures/space-based-architecture/folder-structure.md: Injected a Mermaid classDiagram showing composition (*--).

Design Tokens for Mermaid styles have been correctly adhered to per memory context.

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PR created automatically by Jules for task 368853366788260137 started by @beginwebdev2002

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