fix: refuse abbreviated flags in every script

argparse completed a prefix into the only flag starting with it:
slots.py --emulator read profiles from a directory named after the
emulator and reported nothing, and pipeline.py --all built every pack
variant. Every parser now refuses an abbreviation.

scripts/migrate.py

@@ -493,6 +493,7 @@ def migrate_local(source: Path, target: Path, dry_run: bool) -> tuple:
 
 def main() -> None:
     parser = argparse.ArgumentParser(
+        allow_abbrev=False,
         description="Migrate BIOS files to Manufacturer/Console structure"
     )
     parser.add_argument(