DeepSeek Harness peer-consult plugin

Key features

• The system prompt exposes a bounded roster of live peer Sessions by title and ID.
• The default channel talks to a working fork A′.
• Every channel has a board with goal, known, tasks, and questions.
• ask_peer waits only for the caller-supplied wait_ms, and only when the target was already idle and the consult turn started.
• When work overlaps, the initiating Agent can call ask_peer instead of searching the same ground again.