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/settings.json

@@ -0,0 +1,15 @@
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+    "rust-analyzer.checkOnSave.command": "clippy",
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+    "editor.formatOnSave": true,
+    "[rust]": {
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+    },
+    "files.watcherExclude": {
+        "**/target/**": true
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+    "search.exclude": {
+        "**/target": true
+    }
+}