Enhance Directory Client Library for NIP-XX Protocol

- Introduced a TypeScript client library for the Distributed Directory Consensus Protocol (NIP-XX), providing a high-level API for managing directory events, identity resolution, and trust calculations.
- Implemented core functionalities including event parsing, trust score aggregation, and replication filtering, mirroring the Go implementation.
- Added comprehensive documentation and development guides for ease of use and integration.
- Updated the `.gitignore` to include additional dependencies and build artifacts for the TypeScript client.
- Enhanced validation mechanisms for group tag names and trust levels, ensuring robust input handling and security.
- Created a new `bun.lock` file to manage package dependencies effectively.

pkg/protocol/directory-client/DEVELOPMENT.md

@@ -0,0 +1,55 @@
+# Directory Client Library
+
+TypeScript client library for the Nostr Distributed Directory Consensus Protocol (NIP-XX).
+
+## Project Structure
+
+```
+src/
+├── index.ts              # Main entry point
+├── types.ts              # Type definitions
+├── validation.ts         # Validation functions
+├── parsers.ts            # Event parsers for all kinds
+├── identity-resolver.ts  # Identity & delegation management
+└── helpers.ts            # Utility functions
+```
+
+## Installation
+
+```bash
+cd pkg/protocol/directory-client
+npm install
+```
+
+## Building
+
+```bash
+npm run build
+```
+
+## Development
+
+```bash
+npm run dev  # Watch mode
+```
+
+## Testing
+
+```bash
+npm test
+```
+
+## Features Implemented
+
+- ✅ Type definitions for all directory event kinds (39100-39105)
+- ✅ Event parsers with validation
+- ✅ Identity tag handling and resolution
+- ✅ Key delegation management
+- ✅ Trust calculation utilities
+- ✅ Replication filtering
+- ✅ Comprehensive validation matching Go implementation
+
+## Usage Example
+
+See the main [README.md](./README.md) for detailed usage examples.
+