GH-148726: Forward-port generational GC.#148746

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sergey-miryanov wants to merge 5 commits intopython:mainfrom

sergey-miryanov:feat/gc-gen-3.15

Commits on Apr 20, 2026

Forward-port generational GC.
sergey-miryanov
committed
Remove vestigial comment about "old space bit'.

nascheme
authored and
sergey-miryanov
committed
Remove reference to "incremental GC".

nascheme
authored and
sergey-miryanov
committed
Revert to 3.13 limits for these tests.

nascheme
authored and
sergey-miryanov
committed
Add notes about untrack_dicts() change.

nascheme
authored and
sergey-miryanov
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