Initial commit: waste-go skeleton

Ed25519/X25519/ChaCha20-Poly1305 crypto, peer handshake, mesh state,
IPC server, relay server, and NAT stub. Builds clean on Go 1.22+.

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

.vscode/settings.json

@@ -0,0 +1,21 @@
+{
+    "go.useLanguageServer": true,
+    "go.lintTool": "golangci-lint",
+    "go.lintOnSave": "package",
+    "go.formatTool": "goimports",
+    "go.formatOnSave": true,
+    "editor.formatOnSave": true,
+    "[go]": {
+        "editor.defaultFormatter": "golang.go",
+        "editor.codeActionsOnSave": {
+            "source.organizeImports": "explicit"
+        }
+    },
+    "go.testFlags": ["-v", "-race"],
+    "files.watcherExclude": {
+        "**/bin/**": true
+    },
+    "search.exclude": {
+        "**/bin": true
+    }
+}