Dolt loses an explicit full frame when a named window inherits a base window

## What happened

Dolt loses an explicit full frame when a named window inherits a base window.

## Environment

Dolt main commit `91b1a7043126313a349503269230b874afdf8ded` (`dolt version 2.2.3`). MySQL 8.4.9 was used as the compatibility oracle.

## How to reproduce

```sql
CREATE TABLE t(id INT PRIMARY KEY,g INT,a INT);
INSERT INTO t VALUES (1,0,-6),(2,0,8),(3,1,-9);

SELECT id,MAX(a) OVER w AS x
FROM t
WINDOW base AS (PARTITION BY g),
w AS (base ORDER BY id
ROWS BETWEEN UNBOUNDED PRECEDING AND UNBOUNDED FOLLOWING)
ORDER BY id;
```

The explicit full frame is legal and should be preserved when `w` inherits `PARTITION BY g` from `base`.

## Expected result

MySQL 8.0.43 returns the expected full-frame result:

```text
id x
1 8
2 8
3 -9
```

## Actual result

```text
id,x
1,-6
2,8
3,-9
```

The first row is evaluated as a running frame rather than the requested full partition frame.

Start by running the SQL reproduction in the issue and compare Dolt's output with the MySQL compatibility result. Trace the named-window inheritance and explicit frame handling, then verify that the query preserves the full partition frame and returns the expected values for all three rows.

Written by the indexing model from the issue text.