port: rewrite bootstrap tool in Go

Replace the Python bootstrap script with a Go implementation that
cross-compiles to native binaries for Linux and macOS on x86_64 and
aarch64. The Go port preserves all sections of the original (system
packages, optional Flatpak GUI apps, custom downloads, and the macOS
firecracker VM bridge) and adds first-class pacman support so the tool
works on Arch-family distros alongside Debian, RHEL, and macOS.

A Makefile produces a host binary via `make build` and the full
four-target matrix under dist/ via `make build-all`.

README.md

@@ -1,8 +1,44 @@
-# Usage
+# bootstrap_dev_env
 
-``` shell
-curl -L -o bootstrap.zip https://github.com/JMR-dev/bootstrap_dev_env/archive/refs/heads/main.zip && \
-unzip bootstrap.zip && \
-cd bootstrap_dev_env-main && \
-python3 bootstrap_environment.py
+A Go-based bootstrap tool that installs a development environment across
+macOS, Debian/Ubuntu, RHEL/Fedora, and Arch Linux on `x86_64` and `aarch64`.
+It installs system packages, optional Flatpak GUI apps, and a set of custom
+third-party tools (Go, Neovim, Zig, NVM, pyenv, oh-my-zsh, Firecracker on
+Linux).
+
+## Install
+
+Download the native binary for your platform from a release, or build from
+source:
+
+```shell
+git clone https://github.com/JMR-dev/bootstrap_dev_env.git
+cd bootstrap_dev_env
+make build           # builds ./bootstrap_environment for the host
 ```
+
+To produce native binaries for all four supported targets at once:
+
+```shell
+make build-all       # writes dist/bootstrap_environment-{linux,darwin}-{amd64,arm64}
+```
+
+## Usage
+
+```shell
+# Linux (do NOT use sudo on macOS — Homebrew refuses to run as root)
+sudo ./bootstrap_environment [--only system|flatpak|custom] [--gui]
+
+# macOS
+./bootstrap_environment [--only system|custom] [--gui] [--no-vm]
+```
+
+Flags:
+
+- `--only` — restrict to one section (`system`, `flatpak`, or `custom`).
+- `--gui`  — include GUI applications and the Flatpak section. Default is
+  headless: both are skipped.
+- `--no-vm` — macOS only: skip provisioning the Fedora-on-QEMU/VirtualBox VM
+  that backs the `firecracker()` zsh wrapper.
+
+Package lists live in `packages.go`. Edit and rebuild.