## Summary

This is a follow-up to #23865 generated by prompted Codex as follows:

> Can you find another bug like
#23864 in the formatter for us
to fix?

Here are some examples that previously had their parentheses stripped
(producing syntax errors) but now format correctly:

```python
# Annotated assignments with named expressions
x: (value := int) = 1     # was formatted as: x: value := int = 1

# Annotated assignments with yield
def f():
    y: (yield 1) = 1       # was formatted as: y: yield 1 = 1
    z: (yield 1)            # was formatted as: z: yield 1

# Annotated assignments with await
async def g():
    a: (await g()) = 1      # was formatted as: a: await g() = 1
    b: (await g())           # was formatted as: b: await g()

# Return annotations with await
async def h() -> (await g()):  # was formatted as: async def h() -> await g():
    pass

# Type aliases
type X = (value := int)    # was formatted as: type X = value := int
```

In each case, the parentheses are required for the expression to be
syntactically valid, but the formatter was previously stripping them.