Release v3.77.1

Fixed

• cratis ai install and cratis ai update link .pi/agents to the corpus's Pi-native agent adapters (.cratis/ai/harnesses/pi/agents) when the corpus ships them, so Pi agent loaders other than Cratis' own, such as @tintinweb/pi-subagents, give Cratis agents their read, search, edit and shell tools. An unchanged Cratis-owned link is moved on update; corpora without the adapters keep the canonical .cratis/ai/agents link. (#391)