fix: Add missing templates directory

templates/default/README.md

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+# Agent Workspace Template
+
+This template provides a starting point for agent workspaces.
+
+## Environment Variables
+
+The following environment variables are automatically set:
+- `AGENT_ID`: The identifier for this agent
+- `WORKSPACE_PATH`: The path to this workspace
+- `AGENT_WORKSPACE`: Same as WORKSPACE_PATH
+- `GIT_USER_EMAIL`: Git user email from global config
+- `GIT_USER_NAME`: Git user name from global config
+- `AGENT_CREATED_AT`: Timestamp when workspace was created
+
+## Customization
+
+To add custom environment variables, create a `.env.custom` file in this template directory.