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Body Context: After cleanup, `bundle install` failed again (`Could not find 'bundler' (2.6.7)...`). My shell environment was attempting to use system Ruby's bundler, not the one associated with my project's `rbenv` version (3.2.2), and the required version (2.6.7) wasn't installed for the active Ruby. My Attempt: `gem install bundler:2.6.7`. Learning: `Gemfile.lock` dictates the required Bundler version. I learned to ensure this version is installed *for the correct, active Ruby version* managed by `rbenv` (or similar). Verifying `ruby -v` and `which gem` is key.

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