Initial commit: waste-rs mesh daemon, relay, and proto crates

Full Rust implementation with Ed25519 identity, X25519 ECDH handshake,
ChaCha20-Poly1305 encrypted peer connections, IPC server, and relay server.
Builds on Windows (MSVC), Linux, and macOS.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.vscode/extensions.json

@@ -0,0 +1,9 @@
+{
+    "recommendations": [
+        "rust-lang.rust-analyzer",
+        "vadimcn.vscode-lldb",
+        "serayuzgur.crates",
+        "tamasfe.even-better-toml",
+        "usernamehw.errorlens"
+    ]
+}