## Summary
This adds type inference for comparison expressions involving
intersection types.
For example:
```py
x = get_random_int()
if x != 42:
reveal_type(x == 42) # revealed: Literal[False]
reveal_type(x == 43) # bool
```
closes#13854
## Test Plan
New Markdown-based tests.
---------
Co-authored-by: Carl Meyer <carl@astral.sh>
