What's Changed
- db: add checkpointSubtrees table by @jsha in #8990
- mtca: Serve checkpoints after sequencing and signing by @beautifulentropy in #8974
- ci: remove minio by @jsha in #9024
- ci: remove go 1.26.6 by @jsha in #9026
- MTCProof: use 24-bit length for signatures by @jsha in #9017
Full Changelog: v0.20260908.0...v0.20260921.0