/btw system command for deepseek harness

Key features

• /btw - side question (side question): fork light quantum agent for a disabled tool, answer with context of the current session, answer as command result does not interrupt the main line, do not enter the master dialogue history, do not drop the disc
• Fork programr (packages/subagent/subagent-fork-in-procedure) will use the turn prefix of completed parent session as a id injection sub-session - "a full context"
• /Remember - The original memo function moved here as a whole: to record a by-theway note so that the model can always remember it in this session (steer reacts immediately+ each request is injected + disk lasting).