Fixed CLI crashing after gem install

[HassanAkbar]

gem install dcc produced a binary that crashed on every command, including dcc version.

cli.rb required tty-table, which was only a Gemfile development dependency.
exe/dcc loads that file directly, so every command died with LoadError.

• Drops the require from cli.rb, which never used TTY::Table.
• formatters.rb loads it on first use and falls back to its own plain renderer,
  with a note on stderr pointing at gem install tty-table.
• Adds a spec asserting every gem the CLI requires is declared, unless named optional.

Known and accepted:

• tty-table stays out of the gemspec. It costs 8 further gems that every library
  user would install just to parse XML. It joins the Gemfile's existing :optional
  group beside sinatra and tty-prompt.
• CLI output now varies by install. Both paths render an aligned table.
• The hint goes to stderr, so piped output stays clean data.

[Copilot]

Pull request overview

Fixes a packaging/runtime issue where the installed dcc executable could crash on startup due to a missing runtime dependency, by aligning CLI require usage with gem runtime dependencies and adding a regression spec to prevent recurrence.

Changes:

• Adds tty-table as a runtime dependency in dcc.gemspec.
• Removes an unused require "tty-table" from lib/dcc/cli/cli.rb (leaving tty-table required only where actually needed).
• Adds a spec that scans lib/dcc/cli/** for third-party requires and asserts they are declared runtime dependencies.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.

File	Description
spec/dcc/cli/dependencies_spec.rb	New guard spec to ensure CLI load-time requires map to gem runtime dependencies.
lib/dcc/cli/cli.rb	Removes the tty-table require from CLI entrypoint.
Gemfile	Drops tty-table from dev-only Gemfile dependencies.
dcc.gemspec	Declares tty-table as a runtime dependency for packaged installs.

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

[Copilot]

Pull request overview

Copilot reviewed 4 out of 4 changed files in this pull request and generated no new comments.

[Copilot]

Pull request overview

Copilot reviewed 5 out of 5 changed files in this pull request and generated no new comments.

[Copilot]

Pull request overview

Copilot reviewed 5 out of 5 changed files in this pull request and generated no new comments.

Suppressed comments (1)

spec/dcc/cli/dependencies_spec.rb:14

• root currently resolves to <repo>/spec (since this file lives under spec/dcc/cli), so Gem::Specification.load(File.join(root, "dcc.gemspec")) will look for spec/dcc.gemspec and return nil/error. The gemspec is at the repository root (dcc.gemspec), so this spec will fail as written.

  let(:root) { File.expand_path("../../..", __dir__) }
  let(:gemspec) { Gem::Specification.load(File.join(root, "dcc.gemspec")) }
  let(:declared) { gemspec.runtime_dependencies.map(&:name) }

[Copilot]

Pull request overview

Copilot reviewed 5 out of 5 changed files in this pull request and generated no new comments.