enprot 0.4.2

Engyon Protected Text (EPT) — confidentiality processor and capability ledger
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# Homebrew packaging

`brew install enprot` should work. The formula lives in a separate
Homebrew tap repository, not in this repo. Until that tap exists and a
`0.4.0` source archive is published on GitHub Releases, there is nothing
actionable in this repo. This document captures the recipe so the tap
PR is mechanical.

## The formula

Lives in `riboseinc/homebrew-enprot` as `Formula/enprot.rb`:

```ruby
class Enprot < Formula
  desc "Engyon Protected Text (EPT) confidentiality processor"
  homepage "https://github.com/engyon/enprot"
  url "https://github.com/engyon/enprot/archive/refs/tags/0.4.0.tar.gz"
  sha256 "<replace-with-sha256-of-the-archive>"
  license "BSD-2-Clause"
  head "https://github.com/engyon/enprot.git", branch: "main"

  depends_on "rust" => :build
  depends_on "botan"

  def install
    system "cargo", "install", *std_cargo_args
  end

  test do
    assert_match "Engyon Protected Text", shell_output("#{bin}/enprot --help")
  end
end
```

The formula uses Homebrew's Botan (3.x), which has the modules enprot
needs. AES-GCM-SIV comes from the RustCrypto crate (pure Rust, no
system dep), so the formula doesn't need to do anything special for it.

## User installation

```sh
brew tap riboseinc/enprot
brew install enprot
```

or:

```sh
brew install riboseinc/enprot/enprot
```

## Submission to homebrew-core

Possible but the notability bar (`brew tap-new` and acceptance review)
is higher than maintaining a tap. The tap path is reliable; defer
homebrew-core submission until usage grows.

## Prerequisites in this repo

- Tag `0.4.0` on `main` (the deploy workflow produces a source archive
  automatically once the tag is pushed).
- Update `README.md` with the `brew install` instructions (this can
  land in the same release commit).

## Why this isn't a PR against engyon/enprot

There's nothing to merge here. The formula is the tap repo's first PR.
This document is the design note that closes issue #34.