v171

What's Changed

• fix: read insts as cljc.java-time.instant by @filipesilva in #8850
• use web.game/update-and-send-diffs! for all test actions by @NoahTheDuke in #8852
• fix: default sound to 50% by @filipesilva in #8851
• clean up merge-costs, some other small wins by @NoahTheDuke in #8855
• Clean up logging by @NoahTheDuke in #8844

Full Changelog: v170...v171