The project selector previously used a native list that showed only project names and inherited platform-specific styling. It now presents an accessible rich menu grouped into local projects and remote channels, with folder or channel context for each option.
Release note: 项目选择器现在按本地项目和远程通道分组，并显示目录或通道来源，切换项目时更容易辨认目标。
Replace the flat features directory with document-type and functional-domain navigation, update repository-wide links, and add a top-level documentation index.
Define Task, Conversation, Job, Subjob, Run, Scheduled Task, Goal Task, and Task Center in one canonical document set. Keep Smart Heartbeat ownership separate and leave future partitioned memory explicitly undesigned.
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