[FEATURE] slash command to end a /btw

Preflight Checklist

• [x] I have searched existing requests and this feature hasn't been requested yet
• [x] This is a single feature request (not multiple features)

Problem Statement

I love /btw, but exiting it and returning to the main thread is clumsy. I'd like that to be easier.

Proposed Solution

The btw session knows what its session ID is, so it would seem a natural extension to have a paired /end, or /done, or /wtb, or something do close the btw session and return to the main thread. I am new to the toolchain and maybe this is possible, but Claude did not think so and suggested an RFE.

Alternative Solutions

_No response_

Priority

Low - Nice to have

Feature Category

CLI commands and flags

Use Case Example

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Additional Context

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