docs: update AGENTS.md to require a commit after every change with a sensible message

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Co-Authored-By: opencode <noreply@opencode.ai>

AGENTS.md

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+# AGENTS.md — Agentic Coding Guide for Dotfiles
+
+## Setup, Lint, and Test
+- Main entrypoint: `./setup.sh` (runs all `modules/*.sh` in order)
+- To re-run a single module: `bash modules/XX-name.sh`
+- All scripts must be idempotent and safe to re-run
+- No traditional build/lint/test; test by running setup and checking symlinks/configs
+
+## Code Style & Conventions
+- Bash scripts only; use `paru` for package management (never `pacman`)
+- Add new packages to the relevant `modules/XX-*.sh` script
+- Place new dotfiles in repo root or `.config/` as appropriate
+- Symlinking logic is in `modules/02-symlinks.sh`
+- Scripts must be modular: one concern per module, no duplicated logic
+- Use `$HOME` and relative paths, never hardcode absolute paths
+- Prefer arrays for package lists, and always quote variables
+- Use `set -e` for error handling in scripts
+- Follow naming: `XX-feature.sh` for modules, lowercase, hyphen-separated
+- App configs (Hyprland, Waybar, etc.) go in `.config/` and use includes/fragments if possible
+- All scripts and configs should be readable, commented, and extensible
+
+## Device Profiles
+- Support multiple device types (e.g., laptop, desktop) via an environment variable or setup prompt (`DOTFILES_DEVICE=laptop|desktop`)
+- Use device-specific config fragments (e.g., `monitors-laptop.conf`, `monitors-desktop.conf`) and symlink/include them conditionally
+- Waybar, Hyprland, and input configs should only enable battery, backlight, wifi, and touchpad modules for laptops
+- Setup scripts and symlinking logic must detect device type and use the correct configs
+
+## Copilot/AI Rules
+- See `.github/copilot-instructions.md` for full conventions
+- Never use other package managers or hardcoded paths
+- All changes must be modular, idempotent, and version-controlled
+
+For more, see `README.md` and `.github/copilot-instructions.md`.