Fix ft_launcher Python 3.14 argparse flag

[hexinw-nvidia]

.

[greptile-apps]

Greptile Summary

This PR fixes a one-line omission in the get_args_parser function where the --ft-ignore-missing-cfg flag was registered with add_argument using only keyword arguments and no option string, which raises an error under Python 3.14's stricter argparse validation.

• Adds "--ft-ignore-missing-cfg" as the first positional argument to parser.add_argument(...), making the flag properly registered by the parser in all Python versions including 3.14.
• No logic, behaviour, or other arguments are changed — this is a pure compatibility fix.

Confidence Score: 5/5

Safe to merge — the change is a single-line addition that restores the missing option string for a boolean flag, touching no runtime logic.

The fix is minimal and targeted: adding "--ft-ignore-missing-cfg" as the first argument to an add_argument call that previously had no option string. Without it, Python 3.14's stricter argparse validation raises an error at parser construction time, so the fix is clearly necessary and correct. No other behaviour is altered, and the surrounding argument registrations are unchanged.

No files require special attention — only one line was added to launcher.py and it is straightforwardly correct.

Important Files Changed

Filename	Overview
src/nvidia_resiliency_ext/fault_tolerance/launcher.py	Adds the missing "--ft-ignore-missing-cfg" option string to an add_argument call that previously had only keyword arguments, fixing a Python 3.14 compatibility error.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A[get_args_parser called] --> B[Create ArgumentParser]
    B --> C[Register various ft args]
    C --> D["add_argument with option string added"]
    D --> E{Python version}
    E -->|Before 3.14| F[Silently broken - no option string registered]
    E -->|3.14+| G[Error raised - option string required]
    D -->|After fix| H[Option string present - works on all versions]
    H --> I[Parser returned successfully]

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