tui: add ephemeral /btw side-question threads#14506

Draft

charley-oai wants to merge 7 commits intomainfrom

ccunningham/btw-ephemeral-subagent

Commits on Mar 24, 2026

Add /btw ephemeral side-question threads

charley-oai
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codex
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Fix BTW argument-comment lint

charley-oai
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Fix BTW restack drift on current main

charley-oai
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tui: tighten BTW plumbing and test support

charley-oai
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tui-app-server: discard BTW chain on failover

charley-oai
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Keep BTW forks ephemeral in direct TUI

charley-oai
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codex: fix CI failure on PR #14506

charley-oai
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codex
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