The reader thread spawned in run_agent_pty_blocking was never joined,
leaving a cloned PTY master fd open after the agent exited. When the
pipeline restarted the agent on the same worktree, the stale fd from
the previous session interfered with the new PTY allocation, causing
Claude Code's bundled ripgrep to crash with:
fatal runtime error: assertion failed: output.write(&bytes).is_ok()
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
dave
f16545ec36