Vibe coded prototype.

.devcontainer/devcontainer.json

@@ -0,0 +1,25 @@
+{
+  "name": "Rust Minimal Dev",
+  "build": {
+    "dockerfile": "Dockerfile"
+  },
+  "customizations": {
+    "vscode": {
+      "extensions": [
+        "rust-lang.rust-analyzer",
+        "tamasfe.even-better-toml",
+        "vadimcn.vscode-lldb",
+        "usernamehw.errorlens"
+      ]
+    }
+  },
+  "remoteUser": "vscode",
+  "mounts": [
+    "source=rust-target-cache,target=${containerWorkspaceFolder}/target,type=volume"
+  ],
+  // This runs every time the container starts to ensure the volume is writable
+  "postStartCommand": "sudo chown vscode:vscode ${containerWorkspaceFolder}/target",
+  "settings": {
+    "rust-analyzer.checkOnSave.command": "clippy"
+  }
+}