Add `// Copyright Sunbeam Studios 2026` and `// SPDX-License-Identifier:
Apache-2.0` headers to all source files missing them. Update LICENSE
copyright year, Dockerfile copyright header, and .dockerignore for new
project structure (lean4/, docs/, training artifacts).
Signed-off-by: Sienna Meridian Satterwhite <sienna@sunbeam.pt>
This commit implements comprehensive dual-stack support for the proxy,
allowing it to listen on both IPv4 and IPv6 addresses simultaneously.
Key changes:
- Added new dual_stack.rs module with DualStackTcpListener implementation
- Updated SSH module to use dual-stack listener
- Updated configuration documentation to reflect IPv6 support
- Added comprehensive tests for dual-stack functionality
The implementation is inspired by tokio_dual_stack but implemented
natively without external dependencies. It provides fair connection
distribution between IPv4 and IPv6 clients while maintaining full
backward compatibility with existing IPv4-only configurations.
Signed-off-by: Sienna Meridian Satterwhite <sienna@sunbeam.pt>
