dsh-fusion: Merging multiple DeepSeek Harness sessions into one resumable session

dsh-fusion is an MIT-licensed plugin for DeepSeek Harness that merges 2 to 32 scattered DSH sessions into a new, persistent, and continuous target session context. It generates a snapshot at the current point in time rather than a real-time connection, leaving the source sessions unchanged. Core functions include ordering messages by time or source, deduplicating shared prefixes via stable IDs, retaining only user and assistant text content, and inheriting the caller's environment configuration. The plugin offers four ways to invoke it: a UI dialog, a /fuse text command, a conversation_fusion model tool, and a Service API. Users can configure the maximum number of messages, byte limits, and whether to enable the Smart Planning Agent. The Smart Planning Agent is a tool-less temporary A...