Formatter Incorrectly Rewrites Object Merging in List Comprehensions

The Grafana Jsonnet formatter in VS Code incorrectly rewrites syntactically valid object merging (+) inside a list comprehension. It replaces an object concatenation operation with an explicit key-value pair, which is a destructive change that alters the code's meaning and assumptions about the data structure.

**Steps to Reproduce:**

- VSCode plugin `grafana.vscode-jsonnet 0.7.2`
- Use the VS Code command "Format Document" (or allow formatting on save).

```
env: [{ name: e.key } + e.value for e in std.objectKeysValues(env_)]
```

**Actual Behavior**

The formatter aggressively rewrites the line, changing the logic from object merging to direct key assignment. The code is incorrectly changed to:

```
env: [ { name: e.key, value: e.value } for e in std.objectKeysValues(env_) ]
```

Reproduce the issue with the provided list-comprehension example using the VS Code "Format Document" command and inspect the formatter entry point for this transformation. Trace why object merging with + becomes a key-value pair, then verify that formatting preserves the merge and the code's meaning.

Written by the indexing model from the issue text.