Create repo documentation

AGENTS.md

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+# AGENTS.md
+
+This file provides guidance to AI agents (OpenAI Codex, etc.) when working with this repository.
+
+## Context
+
+**Read `llms.txt` first** for complete project context, architecture decisions, and coding conventions.
+
+The `llms.txt` file references:
+- `README.md` - Project overview and quick start
+- `DEVELOPER_GUIDE.md` - Complete development workflow and setup
+
+Read those files for detailed information. The `llms.txt` file provides a concise summary optimized for AI assistance.

ARCHITECTURE.md

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+# Architecture Overview
+
+This document describes the architecture of the Open Cap Table Protocol (OCP).
+
+## Codebase Structure
+
+- `chain/` - Smart contracts (Solidity, Foundry)
+  - `src/core/` - Core contracts (CapTable, CapTableFactory, Storage)
+  - `src/facets/` - Facet contracts
+  - `src/libraries/` - Shared libraries
+  - `src/interfaces/` - Contract interfaces
+  - `test/` - Foundry tests
+
+- `src/` - Server code (Node.js/TypeScript)
+  - `routes/` - Route handlers
+  - `controllers/` - Business logic controllers
+  - `db/` - MongoDB models and operations
+  - `chain-operations/` - Blockchain interaction utilities
+  - `utils/` - Utility functions
+  - `fairmint/` - Fairmint integration
+  - `rxjs/` - Reactive data processing
+
+## Related Documentation
+
+- [Data Model](docs/DATA_MODEL.md) - Database schema
+- [Configuration](CONFIG.md) - Environment setup
+- [Developer Guide](DEVELOPER_GUIDE.md) - Development workflow
+- [README](README.md) - Project overview

CLAUDE.md

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+# CLAUDE.md
+
+This file provides guidance to Claude Code when working with this repository.
+
+## Context
+
+**Read `llms.txt` first** for complete project context, architecture decisions, and coding conventions.
+
+The `llms.txt` file references:
+- `README.md` - Project overview and quick start
+- `DEVELOPER_GUIDE.md` - Complete development workflow and setup
+
+Read those files for detailed information. The `llms.txt` file provides a concise summary optimized for AI assistance.