[Protocol-zero-0]

Integration update (2026-11-01): KuSh's review of #4768 recommends folding this supplement into the shared entry point. KuSh reports running this exact head (42bb2ec): real pytest -- -k.py matches native, all five arm mutations are caught, and fmt/clippy/tests pass (5220 tests). These are the maintainer's independent results; the validation below records our original runs.

The parent PR remains open with three blocking findings in that review (phpstan option placement, non-UTF-8 argv[0], and coverage of the args_os read). This supplement retains its five-Python-arm scope. Once incorporated, the parent can use Fixes #4753, as KuSh suggests; incorporation and merge are still pending.

This supplement to rtk-ai#4768 folds Pytest | Mypy | Pip | Uv | Sqlfluff into restore_leading_double_dash, as discussed in that PR and rtk-ai#4753. The shared helper restores the clap-consumed leading separator before dispatch, so arguments such as pytest -- -k remain positional instead of selecting tests.

The patch adds the existing five Python process regressions alongside the helper change. It targets the source branch of rtk-ai#4768; it is intended to be incorporated into that PR.

Validation on Linux:

• Five Python process regressions and three existing non-Python process tests pass; formatting and diff checks pass on this commit.
• The same helper change on the same base was previously checked with pytest 9.0.3 and 9.1.1: 24 scenarios / 72 native, original-head and folded-head executions. The five regressions failed on the original head and passed with the change. All-target clippy passed in that trial.

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