#423 fix: init

• chore: update
• chore: update
• chore: update
• chore: update

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Summary by cubic

Cross-platform support for the VS Code settings syncer, adding Linux systemd integration and fixing OS-specific path and watcher handling. Also expands tool PATHs and increases GPG agent cache TTL to reduce prompts.

• New Features

  • Add systemd user service for Linux with inotifywait-based watcher.
  • Keep macOS launchd agent using fswatch.

• Refactors

  • Use OS-specific config paths and sed -i syntax; build PATH via lib.makeBinPath.
  • Update specs to handle macOS/Linux paths and watchers.
  • Expand dotfiles-updater PATH (bash, coreutils, curl, gawk, git, gnumake, gnused, nix, sudo, which).
  • Set GPG agent default/max cache TTL to 3 years on kyber.