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Title

Body What I Did: Reviewed `Gemfile` and removed unused gems. Details: I identified and removed `solid_queue` (no jobs), `solid_cable` (no Action Cable), `jbuilder` (no JSON API), `kamal` (not deployment target), `rubocop-rails-omakase` (no active linting at the time). Ran `bundle install`. Learning: I learned to keep the `Gemfile` lean by removing dependencies that aren't actively used to speed up builds, reduce potential conflicts, and simplify the project. Running `bundle install` after changes is important.

Learned on (YYYY-MM-DD)

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