Complete mbedTLS cleanup - Removed all mbedTLS dependencies and updated documentation

- Moved mbedTLS directories to Trash/ (mbedtls/, mbedtls-install/, mbedtls-arm64-install/)
- Removed obsolete nostr_websocket_mbedtls.c implementation
- Updated nostr_websocket/Makefile to use OpenSSL instead of mbedTLS
- Updated nostr_websocket/README.md with OpenSSL migration notes
- Updated nostr_websocket/EXPORT_GUIDE.md with OpenSSL instructions
- All tests pass: crypto tests, static linking verification
- Build system fully functional with OpenSSL-only dependencies

nostr_websocket/README.md

@@ -5,7 +5,7 @@ A production-ready, lightweight WebSocket client library specifically designed f
 ## Features
 
 - ✅ **WebSocket RFC 6455 Compliant** - Full WebSocket protocol implementation
-- ✅ **SSL/TLS Support** - Secure `wss://` connections via mbedTLS
+- ✅ **SSL/TLS Support** - Secure `wss://` connections via OpenSSL
 - ✅ **NOSTR Protocol** - Built-in support for REQ, EVENT, CLOSE messages
 - ✅ **Production Ready** - Optimized performance and error handling
 - ✅ **Lightweight** - Minimal dependencies and memory footprint
@@ -54,11 +54,11 @@ cJSON_Delete(filter);
 
 ### Core Components
 - **`nostr_websocket_tls.h`** - Public API header
-- **`nostr_websocket_mbedtls.c`** - Main implementation (mbedTLS backend)
+- **`nostr_websocket_openssl.c`** - Main implementation (OpenSSL backend)
 - **`../cjson/cJSON.h/c`** - JSON parsing support
 
 ### Dependencies
-- **mbedTLS** - For SSL/TLS support
+- **OpenSSL** - For SSL/TLS support (libssl, libcrypto)
 - **Standard C libraries** - POSIX sockets, etc.
 
 ## Installation in Other Projects
@@ -121,14 +121,16 @@ make help     # Show help
 
 ## Development History
 
-This library evolved from the experimental WebSocket implementation in `../websocket_experiment/` and represents the production-ready, stable version suitable for integration into other projects.
+This library evolved from the experimental WebSocket implementation and represents the production-ready, stable version suitable for integration into other projects.
 
 Key improvements made during development:
+- **Migrated from mbedTLS to OpenSSL** - Better compatibility and performance
 - Fixed critical WebSocket frame parsing bugs
 - Optimized SSL/TLS performance
 - Reduced memory allocations
 - Enhanced error handling
 - Added comprehensive documentation
+- Improved build system integration
 
 ## License