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Body Context: Even after installing `libpq`, `bundle install` failed again with `Could not find 'bundler' (2.6.7) ...`. My shell was still trying to use the system Ruby's environment/bundler version, indicating `rbenv` wasn't fully integrated/activated for the `bundle` command execution. My Attempt: `gem install bundler` directly, which failed with `Gem::FilePermissionError` (again trying to use system Ruby gems location). Learning: Persistent environment issues suggest deeper problems with my shell initialization (`.zshrc`) or PATH order. I verified my `rbenv` path was missing/incorrectly configured and learned to ensure `rbenv` is active before running `bundle`.

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