* feat(linux): add Ubuntu setup script and improve systemd services
Add comprehensive Ubuntu setup script that transforms a fresh Ubuntu
installation into a native tool building machine with:
- System dependencies (WebKitGTK, GTK3, libappindicator)
- Development tools (Go 1.25.6, Node.js 22.x, gh CLI)
- Claude Code CLI installation
- Core CLI and core-ide from GitHub releases
- XDG autostart configuration
- SSH key generation and GitHub authentication
Improve systemd services:
- Add security hardening to system service (NoNewPrivileges, PrivateTmp,
ProtectSystem)
- Add user-level service for non-root deployment
- Include user service in nfpm package
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
* fix: apply gofmt formatting to io.go and transport_tcp.go
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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Co-authored-by: Claude <developers@lethean.io>
Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>
Co-authored-by: Snider <snider@host.uk.com>
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