Add a completion-menu table to KEYBINDINGS.md covering the new cmp
mappings (Tab/S-Tab and C-n/C-p to move, C-Space to open, Enter to
confirm, C-e to dismiss), and reword the Neovim summary accordingly.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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