Windows: LocalKaos.exec() resets console TrueType font (Consolas) to raster

[biaks]

On Windows, calling LocalKaos.exec() to spawn a subprocess (e.g. PowerShell) with redirected stdin/stdout/stderr pipes causes the parent cmd.exe console's TrueType font (specifically Consolas) to be silently reset to a raster/legacy font. After this, all non-ASCII characters (Cyrillic, emoji, etc.) become invisible. The code page remains UTF-8 (chcp 65001), so the issue is purely the console font being mutated.
Other TrueType fonts (Ubuntu Mono, Iosevka) are unaffected; only Consolis is reset.

Reproduction

1. Open cmd.exe on Windows 10/11.
2. chcp 65001
3. Set console font to Consolas (Properties → Font).
4. Run a script that calls kaos.local.LocalKaos.exec("powershell", "-command", "echo test").
5. After the subprocess exits, type Cyrillic text in the console — characters are invisible/blank.

Root cause

asyncio.create_subprocess_exec() is called without creationflags. On Windows, the child process inherits a console handle, which triggers the OS to re-evaluate the parent console font and fall back to a raster font.

Proposed fix

Pass subprocess.CREATE_NO_WINDOW on Windows to detach the child from the parent console host:

      async def exec(self, *args: str, env: Mapping[str, str] | None = None) -> KaosProcess:
          if not args:
              raise ValueError("At least one argument (the program to execute) is required.")

          import subprocess

          creationflags = 0
          if os.name == "nt":
              creationflags = subprocess.CREATE_NO_WINDOW

          process = await asyncio.create_subprocess_exec(
              *args,
              stdin=asyncio.subprocess.PIPE,
              stdout=asyncio.subprocess.PIPE,
              stderr=asyncio.subprocess.PIPE,
              env=env,
              creationflags=creationflags,
          )
          return self.Process(process)

This change prevents the font reset while keeping all existing functionality intact.