* chore: apply go fix modernizers from Go 1.26
automated refactoring: interface{} to any, slices.Contains,
and other idiomatic updates.
* feat(ci): add `go fix` check to Go analysis workflow
ensures Go 1.26 modernizers are applied, fails CI if `go fix ./...`
produces any changes (similar to existing `go fmt` enforcement)
IPIP-499's unixfs-v1-2025 profile uses 1MiB chunks. with
--raw-leaves=false, protobuf wrapping pushes blocks slightly over 1MiB.
the previous 1MiB SoftBlockLimit rejected these blocks on dag import.
raise SoftBlockLimit to 2MiB to match the bitswap spec, which requires
implementations to support blocks up to 2MiB.
- raise SoftBlockLimit to 2MiB per the bitswap spec
- update error messages and help text
- bump boxo to main with ipfs/boxo#1101 (raised ChunkSizeLimit/BlockSizeLimit,
256-byte overhead budget)
- update sharness tests for 2MiB boundary
- add test/cli boundary tests for block put, dag put, dag import,
ipfs add (raw and wrapped leaves), and bitswap exchange including
regression tests for the libp2p message size hard limit
