[WIP] Implement RFC 41: `lib.fixed`#1578

Draft

vk2seb wants to merge 7 commits intoamaranth-lang:mainfrom

vk2seb:seb/fixed

Commits on Apr 21, 2025

lib.fixed: add initial implementation and test cases
vk2seb
committed

Commits on May 4, 2025

lib.fixed: implement __repr__ to match https://github.com/amaranth-lang/rfcs/pull/41#issuecomment-2849060273
vk2seb
committed
lib/fixed: avoid unnecessary slicing on `reshape()`

vk2seb
and
goekce
authored

Commits on Jun 24, 2025

lib.fixed: fix off-by-one on SQ size inference at lower bound
vk2seb
committed

Commits on Jan 18, 2026