Draw tuples without capturing a pack in a nested lambda

MSVC rejected Gen::Tuples with C3493: the strategies were captured as
a parameter pack and used inside a nested std::apply lambda. The
strategies are now held as one std::tuple and drawn by
Detail::DrawTuple over an index sequence; the comma fold still draws
them strictly left to right, so choice sequences do not change.

Verified: ProgmasoftSelfTest passes with MSVC 19.51 (cl) and with
clang-cl 23, 57 test cases and 75,461 assertions each. The macOS and
CodeQL failures of the previous run were runners that never started.

0 files changed, 0 insertions, 0 deletions