likely broken

Fix review findings: wallpaper, CI workflow, btop theme, input pin master

- Add the generated catppuccin-mocha wallpaper that home/mollyw.nix already referenced — its absence made the whole flake fail to eval - Add the actual CI workflow (.github/.gitkeep placeholder removed) - Pin agenic-journal input to its flake branch until it merges to main (main has no flake.nix after reverting the accidental PR #1 merge) - Install the official catppuccin btop theme file; btop does not ship it, so color_theme would have silently fallen back to default - Restore hardware-configuration.nix verbatim (whitespace drift) Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01E4e3bQXGCUHnhaXoMJk6yE