Add neovim config using nixvim

CLAUDE.md

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+# CLAUDE.md
+
+This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
+
+## Overview
+
+This is a nix-darwin and home-manager configuration for managing a macOS system (Apple Silicon M3 Max) declaratively. The configuration uses Nix flakes and manages both system-level packages (via nix-darwin) and user-level packages and dotfiles (via home-manager).
+
+## Architecture
+
+### Flake Structure
+
+The repository follows a modular architecture:
+
+- **`flake.nix`**: Entry point defining inputs (nixpkgs, nix-darwin, home-manager, nur) and outputs. Defines the main darwin configuration `salarm3max` for aarch64-darwin.
+- **`home.nix`**: Main home-manager configuration importing all program modules and defining system-wide packages.
+- **`programs/default.nix`**: List of program module imports (each program has its own subdirectory with `default.nix`).
+- **`programs/*/default.nix`**: Individual program configurations (fish, git, jujutsu, ghostty, wezterm, zed, etc.).
+
+### Key Design Patterns
+
+1. **Modular Program Configuration**: Each program (fish, git, ghostty, etc.) has its own directory under `programs/` with a `default.nix` file.
+2. **Allowlist for Unfree Packages**: Unfree packages are explicitly allowlisted in `home.nix` using `allowUnfreePredicate`.
+3. **External Config Fetching**: Neovim config is fetched from external GitHub repo (`softinio/nvim-config`) rather than managed in this repo.
+4. **Integration Through Imports**: `programs/default.nix` is a simple list that gets imported into `home.nix`, making it easy to enable/disable programs.
+
+## Common Commands
+
+**Note**: User uses Fish shell, not Bash. All commands below work in Fish.
+
+### Building and Activating Configuration
+
+```fish
+# Build and switch to new configuration (PREFERRED - use this alias)
+nixre
+
+# Full command (if needed)
+darwin-rebuild switch --flake ~/.config/nixpkgs#salarm3max
+
+# Build without switching
+darwin-rebuild build --flake ~/.config/nixpkgs#salarm3max
+```
+
+### Updating Dependencies
+
+```fish
+# Update all flake inputs
+nix flake update
+
+# Update specific input
+nix flake lock --update-input nixpkgs
+```
+
+### Testing Changes
+
+```fish
+# Build configuration locally to test before switching
+nix build .#darwinConfigurations.salarm3max.system
+```
+
+### Maintenance
+
+```fish
+# Garbage collection
+nix-collect-garbage -d  # Also aliased as: nixgc
+
+# Repair Nix store
+nix-store --repair --verify --check-contents  # Also aliased as: nixstorerepair
+
+# Check system info
+nix-shell -p nix-info --run "nix-info -m"  # Also aliased as: nixinfo
+```
+
+## Adding New Programs
+
+To add a new program configuration:
+
+1. Create directory: `programs/newprogram/`
+2. Create `programs/newprogram/default.nix` with configuration
+3. Add `./newprogram` to the list in `programs/default.nix`
+4. Run `nixre` to apply changes
+
+## Important Notes
+
+- **Platform**: This configuration is specifically for `aarch64-darwin` (Apple Silicon Macs).
+- **User**: Configuration is for user `salar` with home directory `/Users/salar`.
+- **Shell**: Fish is the default shell with extensive customizations.
+- **Nix Features**: Experimental features `nix-command` and `flakes` are enabled.
+- **Version Control**: Uses jujutsu (jj) as the primary VCS alongside git.
+- **Editor**: Neovim is the default editor (`$EDITOR` and `$VISUAL` environment variables).