[main] [cleanup] Remove commented-out dead code from EnvironmentVariables

[JoshSalway]

Fixes #84

Summary

EnvironmentVariables.php has 28 lines of commented-out code at the bottom of the file from a previous implementation. Not referenced anywhere.

The commented code was an earlier approach to editing individual environment variables interactively. The current implementation uses file-based replacement instead. If interactive variable editing is needed in the future, it can be revisited as a new feature with a fresh implementation.

Before / After

// Before: file ends with 30 lines of commented-out code
    }
}

//         foreach ($toUpdate as $key) {
//             $this->form()->prompt($key, fn($resolver) => ...
//         }
//         spin(
//             fn() => $this->client->environments()->replaceVariables(
//                 ...
//             ),
//         );
//         success('Environment variables replaced');
//     }
// }

// After: file ends cleanly
    }
}

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