[dev.simd] all: merge master (1cae25d) into dev.simd

Merge List:

+ 2026-06-01 1cae25d6a6 encoding/json: fix typos, grammar, and stale comment references
+ 2026-06-01 943343f7fe cmd/compile: add missing condition in SBFX -> SBFIZ opt
+ 2026-06-01 37699df177 debug/elf: avoid needless inner loops in dynamicVersions
+ 2026-06-01 1fb0cc0128 Revert "go/types: keep generic methods out of method sets"
+ 2026-06-01 c11dd31277 reflect: linkify the docs for Value.Seq and Value.Seq2
+ 2026-06-01 e7bccd364e test: soften traceback speed test
+ 2026-06-01 b9f39083eb encoding/json: mostly fix error offset regression
+ 2026-06-01 2e47ef62c2 go/types: keep generic methods out of method sets
+ 2026-06-01 fc08dcb75d go/types: generate version.go from types2-equivalent
+ 2026-06-01 af5ca31db8 encoding/gob: don't drop entries from large map
+ 2026-06-01 517d4d3c79 net/http/cookiejar: add godoc links
+ 2026-06-01 6559f48782 cmd/compile: use AuxInt for OpMove size in DSE
+ 2026-05-30 7bd807271c regexp: apply canonicalization to scripts lookup
+ 2026-05-29 0d75fdfd4f all: REVERSE MERGE dev.simd (b566743) into master

Change-Id: I4a59ce6445d4fe0969c24472132840f6343a6740