chore: persist Claude authentication in devcontainer

Add Claude config directory mount to avoid re-authentication
when spinning up devcontainers.

Co-Authored-By: Claude Sonnet 4.5 <[email protected]>

Author: Miles Burton

.devcontainer/devcontainer.json

@@ -1,23 +1,23 @@
 {
-    "name": "Arduino Library Development",
-    "dockerFile": "Dockerfile",
-    "mounts": [
-      "source=devcontainer_ssh,target=/home/vscode/.ssh,type=volume",
-      "source=devcontainer_bash_history,target=/home/vscode/.bash_history,type=volume",
-      "source=devcontainer_fish_history,target=/home/vscode/.local/share/fish/fish_history,type=volume"
-    ],
-    "customizations": {
-      "vscode": {
-        "extensions": [
-          "vsciot-vscode.vscode-arduino",
-          "ms-vscode.cpptools",
-          "ms-azuretools.vscode-docker",
-          "yzhang.markdown-all-in-one"
-        ]
-      }
-    },
-    "postCreateCommand": "arduino-cli core install arduino:avr && arduino-cli lib install ArduinoUnit && /usr/local/bin/update-libraries.sh",
-    "updateContentCommand": "/usr/local/bin/update-libraries.sh",
-    "remoteUser": "vscode"
-  }
-  
+  "name": "Arduino Library Development",
+  "dockerFile": "Dockerfile",
+  "mounts": [
+    "source=devcontainer_ssh,target=/home/vscode/.ssh,type=volume",
+    "source=devcontainer_bash_history,target=/home/vscode/.bash_history,type=volume",
+    "source=devcontainer_fish_history,target=/home/vscode/.local/share/fish/fish_history,type=volume",
+    "source=${localEnv:HOME}/.config/claude,target=/home/node/.config/claude,type=bind"
+  ],
+  "customizations": {
+    "vscode": {
+      "extensions": [
+        "vsciot-vscode.vscode-arduino",
+        "ms-vscode.cpptools",
+        "ms-azuretools.vscode-docker",
+        "yzhang.markdown-all-in-one"
+      ]
+    }
+  },
+  "postCreateCommand": "arduino-cli core install arduino:avr && arduino-cli lib install ArduinoUnit && /usr/local/bin/update-libraries.sh",
+  "updateContentCommand": "/usr/local/bin/update-libraries.sh",
+  "remoteUser": "vscode"
+}