Statusline doesn't refresh after /compact command

Description

After running /compact, the statusline continues showing the pre-compaction context percentage. It only updates after the next assistant response.

Steps to Reproduce

1. Configure a custom statusline that displays context usage percentage (via statusLine.command in settings)
2. Have a conversation until context usage is high (e.g., 73%)
3. Run /compact command
4. Observe statusline still shows 73%
5. Wait for assistant to respond
6. Observe statusline now shows correct lower percentage (e.g., 26%)

Expected Behavior

The statusline should refresh immediately after /compact completes, showing the new (lower) context usage.

Actual Behavior

The statusline shows stale data from before compaction until the next assistant response triggers a refresh.

Environment

• Claude Code CLI
• Custom statusline command that reads context_window.current_usage from stdin JSON

Additional Context

The custom statusline script is working correctly - it displays whatever data Claude Code provides. The issue is that Claude Code doesn't call the statusline command with fresh data after /compact runs.

This likely affects other context-changing commands as well, not just /compact.