fixes and docs

docs/systems/macbook-pro.md

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+# MacBook Pro — macOS / nix-darwin (macbook-pro)
+
+`systems/aarch64-darwin/macbook-pro/`
+
+## Overview
+
+This is the [nix-darwin](https://github.com/nix-darwin/nix-darwin) configuration for the same MacBook Pro running macOS. It provides declarative macOS system management alongside Homebrew.
+
+## Key Features
+
+- Touch ID for `sudo`
+- Declarative Homebrew (casks and formulae managed via `nix-homebrew`)
+- `nh` for easy NixOS/darwin rebuilds
+- `attic-client` for accessing the Nix binary cache
+- `macpm` for Apple Silicon power monitoring
+- Rosetta builder available (disabled, on-demand)
+- Linux builder available (disabled)
+
+## Configuration Files
+
+| File | Purpose |
+|---|---|
+| `default.nix` | Main config — packages, users, environment |
+| `homebrew.nix` | Declarative Homebrew casks and formulae |
+| `programs.nix` | macOS program settings |
+| `system.nix` | System defaults (dock, finder, etc.) |
+
+## User
+
+- **Username**: `mattjallen`
+- **Home**: `/Users/mattjallen`
+- **Flake path**: `/Users/mattjallen/nix-config` (set via `NH_OS_FLAKE`)
+
+## Rebuilding
+
+```bash
+darwin-rebuild switch --flake .#macbook-pro
+# or using nh:
+nh darwin switch
+```