Clip summary text and other long fields to fit terminal width:
- Clip display_summary in print_tool_compact (e.g., "47 lines (2.0k chars)")
- Account for header_suffix length when compressing paths in print_tool_output_header
- Clip TODO item lines in print_todo_compact
- Clip plan item descriptions, evidence, touches, checks, and paths in print_plan_compact
- Replace hardcoded 70/40 char limits with dynamic terminal-width-based clipping
All clipping uses clip_line() which handles UTF-8 safely and adds ellipsis.
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