P3923R0 Additional NB Comment Resolutions For Kona 2025

WG21-P3923R0 Additional NB Comment Resolutions For Kona 2025

No feature-test macro is mentioned.

• Section 2.1 changes [tuple.helper].
  • We already implement this unconditionally. I believe GH_000545_include_compare would be the best place to add test coverage for this (instead of adding a whole top-level test).
• Sections 2.2, 2.3, 2.4, and 2.5 patch <hive>, which I've recorded in #5301.
• Section 2.6 patches the parallel range algorithms, which I've recorded in #5610 (thanks @timsong-cpp).
• Section 2.7 patches <meta>, which I've recorded in #5606.
• Sections 2.8 and 2.9 patch std::execution, which I've recorded in #4768.
• Section 2.10 changes [tuple.tuple.general].
  • We already strengthen noexcept here, so we just need to remove those comments from product code (and any test comments).

I'll mark this as Available as I'm willing to review a PR for sections 2.1 and 2.10 before opening up the general C++26 floodgates.

Start with the issue's sections 2.1 and 2.10, then inspect the existing GH_000545_include_compare coverage and the tuple-related implementation and tests. Add coverage for the [tuple.helper] change, and remove the obsolete comments associated with [tuple.tuple.general] from product code and tests. Done means those two sections are addressed without opening separate work already tracked in the linked issues.