docs: Change architecture to Mermaid and add missing documentation files

docs/README.md

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+# GoMCP Documentation
+
+Welcome to the GoMCP documentation. GoMCP is the open-source, mathematically proven secure memory core and orchestration engine for Large Language Models (LLMs). Built on the principles of the Sentinel Lattice, it provides persistent memory with unforgeable constraints.
+
+## Table of Contents
+
+- [**MCP Tools Reference**](mcp-tools.md) — Exhaustive list of 57+ built-in Memory, Session, and Safety tools.
+- [**DIP Pipeline**](security/dip_pipeline.md) — The Declarative Intent Parser that forms the first line of defense.
+- [**CAFL Protocol**](security/cafl.md) — Capability-Attenuating Flow Labels and Data Provenance.
+
+## About Sentinel Lattice
+
+GoMCP uses the Sentinel Lattice framework to enforce security primitives. For in-depth theoretical understanding, see the [Sentinel Lattice Architecture Specification](https://github.com/syntrex-lab/sentinel-community/blob/main/docs/rnd/2026-02-25-sentinel-lattice-architecture.md).