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/export_native.py

@@ -502,6 +502,7 @@ def run(
 
 def main() -> None:
     parser = argparse.ArgumentParser(
+        allow_abbrev=False,
         description="Rewrite each platform's own BIOS file, corrected.",
     )
     group = parser.add_mutually_exclusive_group(required=True)