[krystophny]

Summary

• close the managed Euporie pane and kernel immediately when the final Vim exits, including during startup races
• suppress only the terminal capability probes whose tmux passthrough responses can land in the active Vim pane, while retaining Kitty graphics passthrough
• enable CurveZMQ kernel transport when supported and keep kernel/Euporie diagnostics out of the interactive pane
• support both Euporie 2.x and its newer apptk-based output layer

Validation

• tests/run.sh
• Ruff check and formatting
• Vint over plugin, autoload, and Vim tests
• Debian Bookworm container with Vim 9.0
• live Vim-in-tmux integration test using the current Ghostty environment:
  • state reported Curve transport
  • no Ghostty, Kitty query, or plaintext transport warning leaked into Vim
  • Python output and Matplotlib Kitty-Unicode graphics rendered in Euporie
  • normal quit and a quit 100 ms into startup both removed pane, sidecar, and kernel