Mount entire .ssh directory for SSH agent forwarding

Mount the whole ~/.ssh directory instead of individual files to enable
SSH agent forwarding without stale socket issues. The directory mount
allows the agent socket to come and go without breaking the container.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: blooop

.devcontainer/devcontainer.json

@@ -33,12 +33,12 @@
         "CLAUDE_CONFIG_DIR": "/home/vscode/.claude",
         "XDG_CONFIG_HOME": "/home/vscode/.config",
         "XDG_CACHE_HOME": "/home/vscode/.cache",
-        "XDG_DATA_HOME": "/home/vscode/.local/share"
+        "XDG_DATA_HOME": "/home/vscode/.local/share",
+        "SSH_AUTH_SOCK": "/home/vscode/.ssh/agent.sock"
     },
     "mounts": [
         "source=${localWorkspaceFolderBasename}-pixi,target=${containerWorkspaceFolder}/.pixi,type=volume",
-        "source=${localEnv:HOME}/.ssh/known_hosts,target=/home/vscode/.ssh/known_hosts,type=bind,ro",
-        "source=${localEnv:HOME}/.ssh/config,target=/home/vscode/.ssh/config,type=bind,ro",
+        "source=${localEnv:HOME}/.ssh,target=/home/vscode/.ssh,type=bind",
         "source=${localEnv:HOME}/.config/gh,target=/home/vscode/.config/gh,type=bind"
     ],
     "postCreateCommand": "sudo chown vscode .pixi && pixi install"