feat(docs): autonomous structured expansion on vibe-coding-multi-agent-state-sync

[beginwebdev2002]

Autonomous expansion: Generated deterministic guide on Multi-Agent State Synchronization under the Vibe Coding / AI Agent Orchestration domain. The document strictly adheres to architectural standards (YAML frontmatter, 4-step Pattern Lifecycle, Mermaid sequenceDiagram without classDef, GFM Table, Callouts). Bi-directional links updated in README.md.

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PR created automatically by Jules for task 9826261018539616465 started by @beginwebdev2002

[google-labs-jules]

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