Blomios
b9fd2fb925
Each open/reattach spawned a pump thread feeding pty_bridge[session]. The broadcast hub added a subscriber per attach without dropping the previous one, and the stale pump thread kept delivering (its send_output still succeeded against the new channel) — so every byte was delivered twice (more after further re-attaches). Accumulated on each tab/layout/agent switch; window resize made it glaring. - Broadcast::subscribe() is now single-consumer: a new subscription supersedes the previous one, ending the old pump thread's stream. - PtyBridge gains a per-session generation; register() returns it and unregister_if(session, gen) only removes when still current, so a dying superseded thread can't tear down the channel that replaced it. - All three attach sites (open/reattach/agent launch) use unregister_if. Tests: 6 added (generation guard + single-consumer broadcast). Workspace green. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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