* fix(#3026): document --pi and --gemini in installer --help
--help documented 16 runtime flags but the installer accepts 18: --pi
(named only in banner prose) and --gemini (invisible everywhere). Both
install correctly when passed but are undiscoverable via --help.
Added both to the Options section. Added a parity test that asserts every
accepted runtime flag appears in --help output, with an exclusion set for
legacy aliases (--both, --kimi-code).
* chore(#3026): backfill changeset PR number 3112
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Co-authored-by: sim <sim@local>
60cf18999b