Add renovate.json with a custom regex manager that picks up
`# renovate:` comment directives on ARG lines. This covers:
- Docker base images (handled natively by Renovate's dockerfile manager)
- git-delta, fzf, and zsh-in-docker versions via github-releases
Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
These packages are required for Claude Code's native sandboxing on Linux:
- bubblewrap: Provides filesystem isolation via Linux namespaces
- socat: Enables the network proxy for domain filtering
Without these, the /sandbox command shows installation instructions
instead of enabling sandbox mode.
Ref: https://code.claude.com/docs/en/sandboxing
Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>