v0.20260901.0

What's Changed

• ci: update golangci-lint to 2.13.1 by @jsha in #8965
• ci: add Go 1.27 by @jsha in #8963
• test: Use sunlight as a tlog-mirror by @beautifulentropy in #8976
• mtca/publisher: make MirrorID nullable by @jsha in #8968
• golangci: Address lints raised by building with go1.27.0. by @ezekiel in #8993
• Store Public Keys in tiles coordinate-matched to Entry tiles. by @ezekiel in #8958
• crl: Refuse to publish CRLs that are missing entries by @beautifulentropy in #8984
• add treedb package by @jsha in #8996
• ci: add go1.27 to the test matrix by @jsha in #8994

Full Changelog: v0.20260825.0...v0.20260901.0