Add functions to wake Claude Code's event loop in detached tmux sessions:
- IsSessionAttached: Check if session has attached clients
- WakePane: Always trigger SIGWINCH via resize dance
- WakePaneIfDetached: Smart wrapper that skips attached sessions
When Claude runs in a detached tmux session, its TUI library may not
process stdin until a terminal event occurs. Attaching triggers SIGWINCH
which wakes the event loop. WakePane simulates that by resizing the pane
down 1 row then back up.
NudgeSession and NudgePane now call WakePaneIfDetached after sending
Enter, covering all 22 nudge call sites in the codebase.
Fixes: gt-6s75ln
Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>
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