Ship a concatenated dist/try.rb; gem is dist + bin

[tobi]

Generate one working Ruby file at build time so Spinel has a single
compilation unit and the published gem stays portable (bin/try + dist/try.rb).

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[Copilot]

Pull request overview

This PR shifts the distributable artifact from split Ruby sources to a generated, single-file dist/try.rb, so the gem (and other packaging targets) ship a portable runtime while still supporting optional Spinel AOT compilation from one compilation unit.

Changes:

• Generate and ship a concatenated dist/try.rb and route execution through bin/try (exec native binary when present, otherwise load the Ruby script).
• Update build/test tooling (make dist, rake dist, lint/spec tasks) to validate both split sources and the generated concat.
• Align package managers (RubyGems, Homebrew, Nix) and docs to install/run via bin/try + dist/try.rb.

Reviewed changes

Copilot reviewed 8 out of 9 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
try-cli.gemspec	Switch gem contents to bin/try + generated dist/try.rb (and optional native binary).
README.md	Document new “split sources + build concat” workflow and packaging behavior.
Rakefile	Add dist build task and expand lint/spec to cover dist/try.rb.
Makefile	Add dist/dist-test, install updates, and build native from dist/try.rb.
Formula/try.rb	Homebrew installs bin/try plus dist/try.rb after running make dist.
flake.nix	Nix install now builds dist and installs bin/try + dist/try.rb.
bin/try	Router script: exec dist/try if present, otherwise load dist/try.rb.
AGENTS.md	Update contributor guidelines to reflect split sources + generated concat.
.github/workflows/release.yml	Ensure make dist runs before building/publishing the gem.

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