Feature request: pin / bookmark responses in CLI session

When working in a long session, it's useful to mark specific responses for quick reference.

Request: a /pin command or similar that saves a response (or a user-specified snippet) to a persistent location (e.g. session log or notes file), accessible later without scrolling back through terminal history.

Use case: During a coding session, Claude produces a useful summary, plan, or explanation. The user wants to reference it later without losing it to scroll history or having to re-ask.