nix-flakes-nixvim

Check whether a specific keybinding is already in use across all config/**/*.nix files, including implicit plugin defaults and Neovim built-ins not exposed in Nix.

Verify and update all SKILL.md files under .claude/skills/ so they accurately reflect the actual Nix configuration and current repository structure.

Update all Nix file comments, README.md, and CLAUDE.md to accurately reflect the actual Nix configuration.