docs(arch): autonomous evolution of agentic and microkernel blueprints

[beginwebdev2002]

Refactored agentic-architecture and microkernel-architecture into modular blueprints (data-flow.md, folder-structure.md, implementation-guide.md, and trade-offs.md) complying with Zero-Approval guidelines. Added YAML frontmatter, strict Mermaid design tokens, and the 4-step bad-to-solution cycle.

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PR created automatically by Jules for task 11219715963114400531 started by @beginwebdev2002

[google-labs-jules]

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