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

[beginwebdev2002]

• Scaffolded deterministic module blueprints (data-flow, folder-structure, implementation-guide, trade-offs) for agentic-architecture and microkernel-architecture using the requested 4-step cycle format.
• Properly added the entry maps to the root ./architectures/readme.md
• Ensured .mds map appropriately into _sidebar.md in alphabetical order, resolving architectural missing files.

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PR created automatically by Jules for task 2355932672286738170 started by @beginwebdev2002

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