[v3ai]

What

Two commits that weren't in #1 when it was merged:

1. Install menu. cain -i asks what to install instead of installing everything.
2. CI fix. master's macOS job has been failing since Add cain vps and an install menu (Full / Light / Dotfiles / Keybindings / Server / Custom) #1 was merged. This fixes it.

Install menu

What should cain install?
up/down move   enter pick   q quit

 > Full         programs, dotfiles, keybindings and desktop settings
   Light        dotfiles and keybindings; no programs, no desktop changes
   Dotfiles     just configs, shell aliases and git settings
   Keybindings  just key remaps and shortcuts
   Server       terminal programs and dotfiles, nothing graphical
   Custom       tick each part yourself

• Custom opens a checklist of the install steps: Space ticks one, a toggles all, Enter starts.
• Server only shows on Linux and is the same as cain vps.
• Controls: arrow keys or j/k, Enter, q or Esc to quit.
• Plain cain uses the same kind of menu to ask Install or Collect.
• Skipping the menu:
  • cain install light (or full, dotfiles, keybindings, server) picks a preset directly
  • cain -i -y installs everything
  • with no terminal attached (scripts, CI), cain installs everything as before
• src/tui.c is plain C with no dependencies: termios on Linux/macOS, conio on Windows. It clips lines to the terminal width so redraws don't break, and falls back to a numbered prompt if the output isn't a terminal.

CI fix

The unknown vps step test runs cain vps keys. On macOS, cain vps stops early with "cain vps is for Linux servers", so the expected message never appeared and the test failed. It now only runs on Linux, like the other server tests.

Testing

• CI on this branch is green on Linux, macOS and Windows (MSVC).
• make test: 18 checks pass, including new ones for each preset's steps.
• Builds with -Werror under gcc and clang, and cross-compiles with MinGW.
• Menu: driven through a pseudo-terminal. Checked picking a preset, the Custom checklist, q and Esc to cancel, and the Install/Collect menu.
• Not tested: the Windows console menu was only compiled, never run.

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