Template Sync: fix: 'result' referenced before assignment

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### 🔄 Template Sync Required

Changes from the upstream [vscode-python-tools-extension-template](https://github.com/microsoft/vscode-python-tools-extension-template) have not yet been incorporated into this repository.

#### Source PR
- microsoft/vscode-python-tools-extension-template#159 — fix: 'result' referenced before assignment

#### Summary
The template fixed a bug in `bundled/tool/lsp_jsonrpc.py` where the `result` variable was assigned inside the `if "error" in (redacted) block but then referenced unconditionally in the `return RpcRunResult(result, "")` statement after that block. This causes a `NameError: name 'result' is not defined` whenever the JSON-RPC response contains no `"error"` key (i.e., on success). The fix moves the `result` assignment to before the error check so it is always initialized.

#### Files with missing changes

- **`bundled/tool/lsp_jsonrpc.py`**: The `result = data["result"] if "result" in data else ""` assignment is still indented inside the `if "error" in (redacted) block, but is used outside it. This will raise `NameError` on any successful RPC response.

Current (buggy) code in `run_over_json_rpc`:

```python
if "error" in data:
result = data["result"] if "result" in data else "" # ← only assigned when error present
error = data["error"]

if data.get("exception", False):
return RpcRunResult(result, "", error)
return RpcRunResult(result, error)

return RpcRunResult(result, "") # ← NameError if no "error" in data
```

#### Suggested fix

Move the `result` assignment before the `if "error" in (redacted) block:

````diff
--- a/bundled/tool/lsp_jsonrpc.py
+++ b/bundled/tool/lsp_jsonrpc.py
@@ -237,9 +237,9 @@ def run_over_json_rpc(
if data["id"] != msg_id:
return RpcRunResult(
"", f"Invalid result for request: {json.dumps(msg, indent=4)}"
)

+ result = data["result"] if "result" in data else ""
if "error" in data:
- result = data["result"] if "result" in data else ""
error = data["error"]

if data.get("exception", False):
````

#### Files skipped

None — all changes affect shared template infrastructure.

---
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Start in bundled/tool/lsp_jsonrpc.py, at the run_over_json_rpc function and the result handling around the response error check. Verify that successful JSON-RPC responses no longer reference an uninitialized result, and confirm the existing error and exception paths remain unchanged.

Written by the indexing model from the issue text.