Format Python scripts across the repository (#42109)

## Why

The root Python formatting pass only covered `scripts/`, leaving Python utilities elsewhere in the repository outside `just fmt` and `just fmt-check`.

## What changed

- Run the scripts Ruff formatter from the repository root.
- Exclude `sdk/python`, which has its own formatter pass, and `codex-rs/vendor`.
- Apply Ruff formatting to the newly covered Python files and update the formatter coverage test.

GitOrigin-RevId: 73ac82b8bb9c713d589724f6c4f926399febb513

scripts/format.py

@@ -116,20 +116,10 @@ def python_sdk_formatter_group(*, check: bool) -> FormatterGroup:
 
 
 def python_scripts_formatter_group(*, check: bool) -> FormatterGroup:
-    # The SDK and internal scripts intentionally use separate project roots so
-    # uv and Ruff retain each project's configuration context.
-    args = [
-        "uv",
-        "run",
-        "--frozen",
-        "--project",
-        "scripts",
-        "ruff",
-        "format",
-    ]
+    args = ["uv", "run", "--frozen", "--project", "scripts", "ruff", "format"]
     if check:
         args.append("--check")
-    args.append("scripts")
+    args.append(".")
     return FormatterGroup("Python scripts", (Command(tuple(args)),))