Persists GitHub Copilot CLI settings and chat history across rebuilds

"features": {
    "ghcr.io/rosstaco/devcontainer-features/copilot-persistence:1": {}
}

Inspired by the shell-history pattern, this feature:

1. Mounts a named volume (scoped per dev container via ${devcontainerId}) to /copilot-data
2. Creates a symlink from ~/.copilot → /copilot-data
3. Sets ownership to the container user during installation (auto-detects from $_REMOTE_USER)

Note: If ~/.copilot already exists as a directory during installation, it is moved into the volume at /copilot-data/migrated-<timestamp>/ before the symlink is created.

• ✅ Chat history and sessions
• ✅ CLI configuration (model preferences, settings)
• ✅ Command history
• ✅ Trusted folders

View the volume data:

ls -la /copilot-data

Check the symlink:

ls -la ~/.copilot

Note: This file was auto-generated from the devcontainer-feature.json. Add additional notes to a NOTES.md.